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* Merge branch 'compat' of ↵Linus Torvalds2014-03-31
|\ | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | git://git.kernel.org/pub/scm/linux/kernel/git/s390/linux Pull s390 compat wrapper rework from Heiko Carstens: "S390 compat system call wrapper simplification work. The intention of this work is to get rid of all hand written assembly compat system call wrappers on s390, which perform proper sign or zero extension, or pointer conversion of compat system call parameters. Instead all of this should be done with C code eg by using Al's COMPAT_SYSCALL_DEFINEx() macro. Therefore all common code and s390 specific compat system calls have been converted to the COMPAT_SYSCALL_DEFINEx() macro. In order to generate correct code all compat system calls may only have eg compat_ulong_t parameters, but no unsigned long parameters. Those patches which change parameter types from unsigned long to compat_ulong_t parameters are separate in this series, but shouldn't cause any harm. The only compat system calls which intentionally have 64 bit parameters (preadv64 and pwritev64) in support of the x86/32 ABI haven't been changed, but are now only available if an architecture defines __ARCH_WANT_COMPAT_SYS_PREADV64/PWRITEV64. System calls which do not have a compat variant but still need proper zero extension on s390, like eg "long sys_brk(unsigned long brk)" will get a proper wrapper function with the new s390 specific COMPAT_SYSCALL_WRAPx() macro: COMPAT_SYSCALL_WRAP1(brk, unsigned long, brk); which generates the following code (simplified): asmlinkage long sys_brk(unsigned long brk); asmlinkage long compat_sys_brk(long brk) { return sys_brk((u32)brk); } Given that the C file which contains all the COMPAT_SYSCALL_WRAP lines includes both linux/syscall.h and linux/compat.h, it will generate build errors, if the declaration of sys_brk() doesn't match, or if there exists a non-matching compat_sys_brk() declaration. In addition this will intentionally result in a link error if somewhere else a compat_sys_brk() function exists, which probably should have been used instead. Two more BUILD_BUG_ONs make sure the size and type of each compat syscall parameter can be handled correctly with the s390 specific macros. I converted the compat system calls step by step to verify the generated code is correct and matches the previous code. In fact it did not always match, however that was always a bug in the hand written asm code. In result we get less code, less bugs, and much more sanity checking" * 'compat' of git://git.kernel.org/pub/scm/linux/kernel/git/s390/linux: (44 commits) s390/compat: add copyright statement compat: include linux/unistd.h within linux/compat.h s390/compat: get rid of compat wrapper assembly code s390/compat: build error for large compat syscall args mm/compat: convert to COMPAT_SYSCALL_DEFINE with changing parameter types kexec/compat: convert to COMPAT_SYSCALL_DEFINE with changing parameter types net/compat: convert to COMPAT_SYSCALL_DEFINE with changing parameter types ipc/compat: convert to COMPAT_SYSCALL_DEFINE with changing parameter types fs/compat: convert to COMPAT_SYSCALL_DEFINE with changing parameter types ipc/compat: convert to COMPAT_SYSCALL_DEFINE fs/compat: convert to COMPAT_SYSCALL_DEFINE security/compat: convert to COMPAT_SYSCALL_DEFINE mm/compat: convert to COMPAT_SYSCALL_DEFINE net/compat: convert to COMPAT_SYSCALL_DEFINE kernel/compat: convert to COMPAT_SYSCALL_DEFINE fs/compat: optional preadv64/pwrite64 compat system calls ipc/compat_sys_msgrcv: change msgtyp type from long to compat_long_t s390/compat: partial parameter conversion within syscall wrappers s390/compat: automatic zero, sign and pointer conversion of syscalls s390/compat: add sync_file_range and fallocate compat syscalls ...
| * s390/compat: add copyright statementHeiko Carstens2014-03-29
| | | | | | | | Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
| * compat: include linux/unistd.h within linux/compat.hHeiko Carstens2014-03-20
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | linux/compat.h does not include linux/unistd.h but the compat.h header file contains various conditional #ifdef __ARCH_WANT_COMPAT_... asmlinkage long compat...() #endif compat system call function declarations. If linux/unistd.h isn't included it depends on previous includes if those __ARCH_WANT_COMPAT_... defines are defined or not. So add an additional linux/unistd.h include. Should fix this compile error on tile: include/uapi/asm-generic/unistd.h:195:1: error: 'compat_sys_getdents64' undeclared make[3]: *** [arch/tile/kernel/compat.o] Error 1 Reported-by: Geert Uytterhoeven <geert@linux-m68k.org> Acked-by: Geert Uytterhoeven <geert@linux-m68k.org> Acked-by: Chris Metcalf <cmetcalf@tilera.com> Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
| * s390/compat: get rid of compat wrapper assembly codeHeiko Carstens2014-03-06
| | | | | | | | | | | | | | | | | | Now that all compat syscalls have been converted to use the COMPAT_SYSCALL_DEFINE macros, we don't need to compat syscall wrapper assembly code anymore. So remove it and fix up the system call table accordingly. Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
| * s390/compat: build error for large compat syscall argsHeiko Carstens2014-03-06
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Enforce 32 bit types for all compat syscall argument types. This way we can make sure that all arguments get correct sign or zero extension. Otherwise incorrect code would be generated. E.g. for a 'long' type the COMPAT_SYSCALL_DEFINE macro wouldn't generate code that would cause sign extension of the passed in 32 bit user space parameter. This can cause quite subtle bugs like e.g. the one that was fixed with dfd948e32af2e "fs/compat: fix parameter handling for compat readv/writev syscalls". Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
| * mm/compat: convert to COMPAT_SYSCALL_DEFINE with changing parameter typesHeiko Carstens2014-03-06
| | | | | | | | | | | | | | | | In order to allow the COMPAT_SYSCALL_DEFINE macro generate code that performs proper zero and sign extension convert all 64 bit parameters to their corresponding 32 bit compat counterparts. Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
| * kexec/compat: convert to COMPAT_SYSCALL_DEFINE with changing parameter typesHeiko Carstens2014-03-06
| | | | | | | | | | | | | | | | In order to allow the COMPAT_SYSCALL_DEFINE macro generate code that performs proper zero and sign extension convert all 64 bit parameters to their corresponding 32 bit compat counterparts. Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
| * net/compat: convert to COMPAT_SYSCALL_DEFINE with changing parameter typesHeiko Carstens2014-03-06
| | | | | | | | | | | | | | | | In order to allow the COMPAT_SYSCALL_DEFINE macro generate code that performs proper zero and sign extension convert all 64 bit parameters to their corresponding 32 bit compat counterparts. Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
| * ipc/compat: convert to COMPAT_SYSCALL_DEFINE with changing parameter typesHeiko Carstens2014-03-06
| | | | | | | | | | | | | | | | In order to allow the COMPAT_SYSCALL_DEFINE macro generate code that performs proper zero and sign extension convert all 64 bit parameters to their corresponding 32 bit compat counterparts. Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
| * fs/compat: convert to COMPAT_SYSCALL_DEFINE with changing parameter typesHeiko Carstens2014-03-06
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Some fs compat system calls have unsigned long parameters instead of compat_ulong_t. In order to allow the COMPAT_SYSCALL_DEFINE macro generate code that performs proper zero and sign extension convert all 64 bit parameters their corresponding 32 bit counterparts. compat_sys_io_getevents() is a bit different: the non-compat version has signed parameters for the "min_nr" and "nr" parameters while the compat version has unsigned parameters. So change this as well. For all practical purposes this shouldn't make any difference (doesn't fix a real bug). Also introduce a generic compat_aio_context_t type which can be used everywhere. The access_ok() check within compat_sys_io_getevents() got also removed since the non-compat sys_io_getevents() should be able to handle everything anyway. Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
| * ipc/compat: convert to COMPAT_SYSCALL_DEFINEHeiko Carstens2014-03-06
| | | | | | | | | | | | | | | | | | | | Convert all compat system call functions where all parameter types have a size of four or less than four bytes, or are pointer types to COMPAT_SYSCALL_DEFINE. The implicit casts within COMPAT_SYSCALL_DEFINE will perform proper zero and sign extension to 64 bit of all parameters if needed. Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
| * fs/compat: convert to COMPAT_SYSCALL_DEFINEHeiko Carstens2014-03-06
| | | | | | | | | | | | | | | | | | | | Convert all compat system call functions where all parameter types have a size of four or less than four bytes, or are pointer types to COMPAT_SYSCALL_DEFINE. The implicit casts within COMPAT_SYSCALL_DEFINE will perform proper zero and sign extension to 64 bit of all parameters if needed. Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
| * security/compat: convert to COMPAT_SYSCALL_DEFINEHeiko Carstens2014-03-06
| | | | | | | | | | | | | | | | | | | | Convert all compat system call functions where all parameter types have a size of four or less than four bytes, or are pointer types to COMPAT_SYSCALL_DEFINE. The implicit casts within COMPAT_SYSCALL_DEFINE will perform proper zero and sign extension to 64 bit of all parameters if needed. Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
| * mm/compat: convert to COMPAT_SYSCALL_DEFINEHeiko Carstens2014-03-06
| | | | | | | | | | | | | | | | | | | | Convert all compat system call functions where all parameter types have a size of four or less than four bytes, or are pointer types to COMPAT_SYSCALL_DEFINE. The implicit casts within COMPAT_SYSCALL_DEFINE will perform proper zero and sign extension to 64 bit of all parameters if needed. Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
| * net/compat: convert to COMPAT_SYSCALL_DEFINEHeiko Carstens2014-03-06
| | | | | | | | | | | | | | | | | | | | Convert all compat system call functions where all parameter types have a size of four or less than four bytes, or are pointer types to COMPAT_SYSCALL_DEFINE. The implicit casts within COMPAT_SYSCALL_DEFINE will perform proper zero and sign extension to 64 bit of all parameters if needed. Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
| * kernel/compat: convert to COMPAT_SYSCALL_DEFINEHeiko Carstens2014-03-06
| | | | | | | | | | | | | | | | | | | | Convert all compat system call functions where all parameter types have a size of four or less than four bytes, or are pointer types to COMPAT_SYSCALL_DEFINE. The implicit casts within COMPAT_SYSCALL_DEFINE will perform proper zero and sign extension to 64 bit of all parameters if needed. Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
| * fs/compat: optional preadv64/pwrite64 compat system callsHeiko Carstens2014-03-06
| | | | | | | | | | | | | | | | | | | | | | | | The preadv64/pwrite64 have been implemented for the x32 ABI, in order to allow passing 64 bit arguments from user space without splitting them into two 32 bit parameters, like it would be necessary for usual compat tasks. Howevert these two system calls are only being used for the x32 ABI, so add __ARCH_WANT_COMPAT defines for these two compat syscalls and make these two only visible for x86. Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
| * ipc/compat_sys_msgrcv: change msgtyp type from long to compat_long_tHeiko Carstens2014-03-06
| | | | | | | | | | | | | | | | | | | | Change the type of compat_sys_msgrcv's msgtyp parameter from long to compat_long_t, since compat user space passes only a 32 bit signed value. Let the compat wrapper do proper sign extension to 64 bit of this parameter. Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
| * s390/compat: partial parameter conversion within syscall wrappersHeiko Carstens2014-03-04
| | | | | | | | | | | | | | | | | | | | | | | | | | | | Parameter conversion within the system call wrappers is only needed for parameters which differ in size and have a size of eight bytes on 64 bit. For system call parameters with a size of less than eight byte the called system call itself will perform parameter conversion anyway. So we can save the double conversion of e.g. int parameters. The only types which need to be converted are therefore pointer and (unsigned) long parameters. Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
| * s390/compat: automatic zero, sign and pointer conversion of syscallsHeiko Carstens2014-03-04
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Instead of explicitly changing compat system call parameters from e.g. unsigned long to compat_ulong_t let the COMPAT_SYSCALL_WRAP macros automatically detect (unsigned) long parameters and zero and sign extend them automatically. The resulting binary is completely identical. In addition add a sys_[system call name] prototype for each system call wrapper. This will cause compile errors if the prototype does not match the prototype in include/linux/syscall.h. Therefore we should now always get the correct zero and sign extension of system call parameters. Pointers are handled like before. Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
| * s390/compat: add sync_file_range and fallocate compat syscallsHeiko Carstens2014-03-04
| | | | | | | | | | | | | | | | | | | | The compat syscall wrappers for sync_file_range and fallocate merged 32 bit parameters into 64 bit parameters. Therefore they did more than just the usual zero and/or sign extension of system call parameters. So convert these two wrappers to full s390 specific compat sytem calls. Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
| * s390/compat: convert system call wrappers to C part 15Heiko Carstens2014-03-04
| | | | | | | | Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
| * s390/compat: convert system call wrappers to C part 14Heiko Carstens2014-03-04
| | | | | | | | Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
| * s390/compat: convert system call wrappers to C part 13Heiko Carstens2014-03-04
| | | | | | | | Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
| * s390/compat: convert system call wrappers to C part 12Heiko Carstens2014-03-04
| | | | | | | | Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
| * s390/compat: convert system call wrappers to C part 11Heiko Carstens2014-03-04
| | | | | | | | Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
| * s390/compat: convert system call wrappers to C part 10Heiko Carstens2014-03-04
| | | | | | | | Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
| * s390/compat: convert system call wrappers to C part 09Heiko Carstens2014-03-04
| | | | | | | | Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
| * s390/compat: convert system call wrappers to C part 08Heiko Carstens2014-03-04
| | | | | | | | Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
| * s390/compat: convert system call wrappers to C part 07Heiko Carstens2014-03-04
| | | | | | | | Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
| * s390/compat: convert system call wrappers to C part 06Heiko Carstens2014-03-04
| | | | | | | | Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
| * s390/compat: convert system call wrappers to C part 05Heiko Carstens2014-03-04
| | | | | | | | Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
| * s390/compat: convert system call wrappers to C part 04Heiko Carstens2014-03-04
| | | | | | | | Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
| * s390/compat: convert system call wrappers to C part 03Heiko Carstens2014-03-04
| | | | | | | | Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
| * s390/compat: convert system call wrappers to C part 02Heiko Carstens2014-03-04
| | | | | | | | Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
| * s390/compat: convert system call wrappers to C part 01Heiko Carstens2014-03-04
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Introduce a new compat_wrap.c file which contains the s390 specific compat system call wrappers. The s390 specific system call wrappers only perform sign, zero and pointer conversion of system call arguments before actually calling the non-compat system call. Therefore introduce COMPAT_SYSCALL_WRAPx macros which generate C code that is nearly identical to the assembly code. This has the advantage that the compile will generate correct code, and we avoid the frequent copy-paste errors seen in the compat_wrapper.S file. Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
| * s390/compat: convert to COMPAT_SYSCALL_DEFINEx part 7Heiko Carstens2014-03-04
| | | | | | | | Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
| * s390/compat: convert to COMPAT_SYSCALL_DEFINEx part 6Heiko Carstens2014-03-04
| | | | | | | | Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
| * s390/compat: convert to COMPAT_SYSCALL_DEFINEx part 5Heiko Carstens2014-03-04
| | | | | | | | Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
| * s390/compat: convert to COMPAT_SYSCALL_DEFINEx part 4Heiko Carstens2014-03-04
| | | | | | | | Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
| * s390/compat: convert to COMPAT_SYSCALL_DEFINEx part 3Heiko Carstens2014-03-04
| | | | | | | | Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
| * s390/compat: convert to COMPAT_SYSCALL_DEFINEx part 2Heiko Carstens2014-03-04
| | | | | | | | Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
| * s390/compat: convert to COMPAT_SYSCALL_DEFINEx part 1Heiko Carstens2014-03-04
| | | | | | | | | | | | | | Convert s390 specific system calls to to the new COMPAT_SYSCALL_DEFINE macro. This allows us to get rid of the assembly compat wrappers. Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
| * compat: add COMPAT_SYSCALL_DEFINE0 macroHeiko Carstens2014-03-04
| | | | | | | | | | | | | | For consistency reason add a COMPAT_SYSCALL_DEFINE0 macro. This macro should be used for compat system calls with zero parameters. Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
| * compat: let architectures define __ARCH_WANT_COMPAT_SYS_GETDENTS64Heiko Carstens2014-03-04
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | For architecture dependent compat syscalls in common code an architecture must define something like __ARCH_WANT_<WHATEVER> if it wants to use the code. This however is not true for compat_sys_getdents64 for which architectures must define __ARCH_OMIT_COMPAT_SYS_GETDENTS64 if they do not want the code. This leads to the situation where all architectures, except mips, get the compat code but only x86_64, arm64 and the generic syscall architectures actually use it. So invert the logic, so that architectures actively must do something to get the compat code. This way a couple of architectures get rid of otherwise dead code. Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
* | Merge branch 'x86-asmlinkage-for-linus' of ↵Linus Torvalds2014-03-31
|\ \ | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip Pull x86 LTO changes from Peter Anvin: "More infrastructure work in preparation for link-time optimization (LTO). Most of these changes is to make sure symbols accessed from assembly code are properly marked as visible so the linker doesn't remove them. My understanding is that the changes to support LTO are still not upstream in binutils, but are on the way there. This patchset should conclude the x86-specific changes, and remaining patches to actually enable LTO will be fed through the Kbuild tree (other than keeping up with changes to the x86 code base, of course), although not necessarily in this merge window" * 'x86-asmlinkage-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: (25 commits) Kbuild, lto: Handle basic LTO in modpost Kbuild, lto: Disable LTO for asm-offsets.c Kbuild, lto: Add a gcc-ld script to let run gcc as ld Kbuild, lto: add ld-version and ld-ifversion macros Kbuild, lto: Drop .number postfixes in modpost Kbuild, lto, workaround: Don't warn for initcall_reference in modpost lto: Disable LTO for sys_ni lto: Handle LTO common symbols in module loader lto, workaround: Add workaround for initcall reordering lto: Make asmlinkage __visible x86, lto: Disable LTO for the x86 VDSO initconst, x86: Fix initconst mistake in ts5500 code initconst: Fix initconst mistake in dcdbas asmlinkage: Make trace_hardirqs_on/off_caller visible asmlinkage, x86: Fix 32bit memcpy for LTO asmlinkage Make __stack_chk_failed and memcmp visible asmlinkage: Mark rwsem functions that can be called from assembler asmlinkage asmlinkage: Make main_extable_sort_needed visible asmlinkage, mutex: Mark __visible asmlinkage: Make trace_hardirq visible ...
| * | Kbuild, lto: Handle basic LTO in modpostAndi Kleen2014-02-13
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | - Don't warn about LTO marker symbols. modpost runs before the linker, so the module is not necessarily LTOed yet. - Don't complain about .gnu.lto* sections Signed-off-by: Andi Kleen <ak@linux.intel.com> Link: http://lkml.kernel.org/r/1391846481-31491-13-git-send-email-ak@linux.intel.com Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>
| * | Kbuild, lto: Disable LTO for asm-offsets.cAndi Kleen2014-02-13
| | | | | | | | | | | | | | | | | | | | | | | | | | | The asm-offset.c technique to fish data out of the assembler file does not work with LTO. Just disable for the asm-offset.c build. Signed-off-by: Andi Kleen <ak@linux.intel.com> Link: http://lkml.kernel.org/r/1391846481-31491-11-git-send-email-ak@linux.intel.com Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>
| * | Kbuild, lto: Add a gcc-ld script to let run gcc as ldAndi Kleen2014-02-13
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | For LTO we need to run the link step with gcc, not ld. Since there are a lot of linker options passed to it, add a gcc-ld wrapper that wraps them as -Wl, Signed-off-by: Andi Kleen <ak@linux.intel.com> Link: http://lkml.kernel.org/r/1391846481-31491-10-git-send-email-ak@linux.intel.com Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>
| * | Kbuild, lto: add ld-version and ld-ifversion macrosAndi Kleen2014-02-13
| | | | | | | | | | | | | | | | | | | | | | | | To check the linker version. Used by the LTO makefile. Signed-off-by: Andi Kleen <ak@linux.intel.com> Link: http://lkml.kernel.org/r/1391846481-31491-9-git-send-email-ak@linux.intel.com Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>
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