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| author | Andy Lutomirski <luto@kernel.org> | 2016-09-29 12:48:12 -0700 |
|---|---|---|
| committer | Thomas Gleixner <tglx@linutronix.de> | 2016-09-30 12:40:12 +0200 |
| commit | 1ef55be16ed69538f89e0a6508be5e62fdc9851c (patch) | |
| tree | 623f3cb97a13b616e813aeadb46a56689d555141 /arch/x86/kernel/paravirt.c | |
| parent | d7e25c66c9bf882450060fd9464e784bd229d3ae (diff) | |
| download | linux-1ef55be16ed69538f89e0a6508be5e62fdc9851c.tar.bz2 | |
x86/asm: Get rid of __read_cr4_safe()
We use __read_cr4() vs __read_cr4_safe() inconsistently. On
CR4-less CPUs, all CR4 bits are effectively clear, so we can make
the code simpler and more robust by making __read_cr4() always fix
up faults on 32-bit kernels.
This may fix some bugs on old 486-like CPUs, but I don't have any
easy way to test that.
Signed-off-by: Andy Lutomirski <luto@kernel.org>
Cc: Brian Gerst <brgerst@gmail.com>
Cc: Borislav Petkov <bp@alien8.de>
Cc: david@saggiorato.net
Link: http://lkml.kernel.org/r/ea647033d357d9ce2ad2bbde5a631045f5052fb6.1475178370.git.luto@kernel.org
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Diffstat (limited to 'arch/x86/kernel/paravirt.c')
| -rw-r--r-- | arch/x86/kernel/paravirt.c | 1 |
1 files changed, 0 insertions, 1 deletions
diff --git a/arch/x86/kernel/paravirt.c b/arch/x86/kernel/paravirt.c index bef340082d20..bbf3d5933eaa 100644 --- a/arch/x86/kernel/paravirt.c +++ b/arch/x86/kernel/paravirt.c @@ -332,7 +332,6 @@ __visible struct pv_cpu_ops pv_cpu_ops = { .read_cr0 = native_read_cr0, .write_cr0 = native_write_cr0, .read_cr4 = native_read_cr4, - .read_cr4_safe = native_read_cr4_safe, .write_cr4 = native_write_cr4, #ifdef CONFIG_X86_64 .read_cr8 = native_read_cr8, |