arch: switch the default on ARCH_HAS_SG_CHAIN

These days architectures are mostly out of the business of dealing with
struct scatterlist at all, unless they have architecture specific iommu
drivers.  Replace the ARCH_HAS_SG_CHAIN symbol with a ARCH_NO_SG_CHAIN
one only enabled for architectures with horrible legacy iommu drivers
like alpha and parisc, and conditionally for arm which wants to keep it
disable for legacy platforms.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Palmer Dabbelt <palmer@sifive.com>

2 files changed, 2 insertions, 2 deletions

diff --git a/lib/Kconfig b/lib/Kconfig
index a9965f4af4dd..d5a5e2ebf286 100644
--- a/lib/Kconfig
+++ b/lib/Kconfig
@@ -577,7 +577,7 @@ config SG_POOL
 # sg chaining option
 #
 
-config ARCH_HAS_SG_CHAIN
+config ARCH_NO_SG_CHAIN
         def_bool n
 
 config ARCH_HAS_PMEM_API
diff --git a/lib/scatterlist.c b/lib/scatterlist.c
index 7c6096a71704..9ba349e775ef 100644
--- a/lib/scatterlist.c
+++ b/lib/scatterlist.c
@@ -271,7 +271,7 @@ int __sg_alloc_table(struct sg_table *table, unsigned int nents,
 
         if (nents == 0)
                 return -EINVAL;
-#ifndef CONFIG_ARCH_HAS_SG_CHAIN
+#ifdef CONFIG_ARCH_NO_SG_CHAIN
         if (WARN_ON_ONCE(nents > max_ents))
                 return -EINVAL;
 #endif