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| author |   Jim Mattson <jmattson@google.com> | 2018-05-13 17:33:57 -0400 |
|---|---|---|
| committer |   Thomas Gleixner <tglx@linutronix.de> | 2018-05-14 10:34:28 +0200 |
| commit | 5f2b745f5e1304f438f9b2cd03ebc8120b6e0d3b (patch) | |
| tree | f049f1b6f8802ea9f44349ae78f368429dad5123 /arch/x86 | |
| parent | x86/bugs: Fix the parameters alignment and missing void (diff) | |
| download | linux-dev-5f2b745f5e1304f438f9b2cd03ebc8120b6e0d3b.tar.xz linux-dev-5f2b745f5e1304f438f9b2cd03ebc8120b6e0d3b.zip | |
x86/cpu: Make alternative_msr_write work for 32-bit code
Cast val and (val >> 32) to (u32), so that they fit in a
general-purpose register in both 32-bit and 64-bit code.
[ tglx: Made it u32 instead of uintptr_t ]
Fixes: c65732e4f721 ("x86/cpu: Restore CPUID_8000_0008_EBX reload")
Signed-off-by: Jim Mattson <jmattson@google.com>
Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Acked-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'arch/x86')
| -rw-r--r-- | arch/x86/include/asm/nospec-branch.h | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/arch/x86/include/asm/nospec-branch.h b/arch/x86/include/asm/nospec-branch.h index 328ea3cb769f..bc258e644e5e 100644 --- a/arch/x86/include/asm/nospec-branch.h +++ b/arch/x86/include/asm/nospec-branch.h @@ -265,8 +265,8 @@ void alternative_msr_write(unsigned int msr, u64 val, unsigned int feature) { asm volatile(ALTERNATIVE("", "wrmsr", %c[feature]) : : "c" (msr), - "a" (val), - "d" (val >> 32), + "a" ((u32)val), + "d" ((u32)(val >> 32)), [feature] "i" (feature) : "memory"); } |