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| author | Linus Torvalds <torvalds@linux-foundation.org> | 2015-06-22 17:51:59 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2015-06-22 17:51:59 -0700 |
| commit | 650ec5a6bd5df4ab0c9ef38d05b94cd82fb99ad8 (patch) | |
| tree | 90a6a6dec4f2383373600c55b04a01b05fe75c2a | |
| parent | 35ffccdb7e014a88c58e3161b36fe8890f5bab7b (diff) | |
| parent | 04c17341b42699a5859a8afa05e64ba08a4e5235 (diff) | |
Merge branch 'x86-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
Pull x86 warning fixlet from Ingo Molnar:
"A build fix for certain (rare) variants of binutils that did not make
it into v4.1"
* 'x86-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
x86/boot: Fix overflow warning with 32-bit binutils
| -rw-r--r-- | arch/x86/kernel/head_32.S | 13 |
1 files changed, 10 insertions, 3 deletions
diff --git a/arch/x86/kernel/head_32.S b/arch/x86/kernel/head_32.S index 53eeb226657c..7e429c99c728 100644 --- a/arch/x86/kernel/head_32.S +++ b/arch/x86/kernel/head_32.S @@ -62,9 +62,16 @@ #define PAGE_TABLE_SIZE(pages) ((pages) / PTRS_PER_PGD) #endif -/* Number of possible pages in the lowmem region */ -LOWMEM_PAGES = (((1<<32) - __PAGE_OFFSET) >> PAGE_SHIFT) - +/* + * Number of possible pages in the lowmem region. + * + * We shift 2 by 31 instead of 1 by 32 to the left in order to avoid a + * gas warning about overflowing shift count when gas has been compiled + * with only a host target support using a 32-bit type for internal + * representation. + */ +LOWMEM_PAGES = (((2<<31) - __PAGE_OFFSET) >> PAGE_SHIFT) + /* Enough space to fit pagetables for the low memory linear map */ MAPPING_BEYOND_END = PAGE_TABLE_SIZE(LOWMEM_PAGES) << PAGE_SHIFT |