x86: rename CONFIG_NONPROMISC_DEVMEM to CONFIG_PROMISC_DEVMEM

Linus observed:

> The real bug is that we shouldn't have "double negatives", and
> certainly not negative config options. Making that "promiscuous
> /dev/mem" option a negated thing as a config option was bad.

right ... lets rename this option. There should never be a negation
in config options.

[ that reminds me of CONFIG_SCHED_NO_NO_OMIT_FRAME_POINTER, but that
  is for another commit ;-) ]

Signed-off-by: Ingo Molnar <mingo@elte.hu>

3 files changed, 8 insertions, 7 deletions

diff --git a/arch/x86/Kconfig.debug b/arch/x86/Kconfig.debug
index ae36bfa814e5..f0cf5d990794 100644
--- a/arch/x86/Kconfig.debug
+++ b/arch/x86/Kconfig.debug
@@ -5,10 +5,11 @@ config TRACE_IRQFLAGS_SUPPORT
 
 source "lib/Kconfig.debug"
 
-config NONPROMISC_DEVMEM
-        bool "Filter access to /dev/mem"
+config PROMISC_DEVMEM
+        bool "Allow unlimited access to /dev/mem"
+        default y
         help
-          If this option is left off, you allow userspace access to all
+          If this option is left on, you allow userspace (root) access to all
           of memory, including kernel and userspace memory. Accidental
           access to this is obviously disastrous, but specific access can
           be used by people debugging the kernel.
diff --git a/arch/x86/mm/pat.c b/arch/x86/mm/pat.c
index d4585077977a..c34dc483839c 100644
--- a/arch/x86/mm/pat.c
+++ b/arch/x86/mm/pat.c
@@ -373,8 +373,8 @@ pgprot_t phys_mem_access_prot(struct file *file, unsigned long pfn,
         return vma_prot;
 }
 
-#ifdef CONFIG_NONPROMISC_DEVMEM
-/* This check is done in drivers/char/mem.c in case of NONPROMISC_DEVMEM*/
+#ifndef CONFIG_PROMISC_DEVMEM
+/* This check is done in drivers/char/mem.c in case of !PROMISC_DEVMEM*/
 static inline int range_is_allowed(unsigned long pfn, unsigned long size)
 {
         return 1;
@@ -398,7 +398,7 @@ static inline int range_is_allowed(unsigned long pfn, unsigned long size)
         }
         return 1;
 }
-#endif /* CONFIG_NONPROMISC_DEVMEM */
+#endif /* CONFIG_PROMISC_DEVMEM */
 
 int phys_mem_access_prot_allowed(struct file *file, unsigned long pfn,
                                 unsigned long size, pgprot_t *vma_prot)
diff --git a/drivers/char/mem.c b/drivers/char/mem.c
index 070e22e8ea9e..de05775bd687 100644
--- a/drivers/char/mem.c
+++ b/drivers/char/mem.c
@@ -80,7 +80,7 @@ static inline int valid_mmap_phys_addr_range(unsigned long pfn, size_t size)
 }
 #endif
 
-#ifdef CONFIG_NONPROMISC_DEVMEM
+#ifndef CONFIG_PROMISC_DEVMEM
 static inline int range_is_allowed(unsigned long pfn, unsigned long size)
 {
         u64 from = ((u64)pfn) << PAGE_SHIFT;