On Mon, 2015-20-07 at 02:58:43 UTC, Anshuman Khandual wrote:
> This patch adds one helper function 'sigcontext_vmx_regs' which computes
> quad word aligned pointer for 'vmx_reserve' array element in sigcontext
> structure making the code more readable.
>
> diff --git a/arch/powerpc/kernel/signal_64.c b/arch/powerpc/kernel/signal_64.c
> index c7c24d2..bb9c939 100644
> --- a/arch/powerpc/kernel/signal_64.c
> +++ b/arch/powerpc/kernel/signal_64.c
> @@ -74,6 +74,16 @@ static const char fmt64[] = KERN_INFO \
> "%s[%d]: bad frame in %s: %016lx nip %016lx lr %016lx\n";
>
> /*
> + * This computes quad word aligned pointer for 'vmx_reserve' array element
> + * which is used primarily in assigning to the preceding pointer 'v_regs'
> + * in sigcontext structure.
How about:
* This computes a quad word aligned pointer inside the vmx_reserve array
* element. For historical reasons sigcontext might not be quad word aligned,
* but the location we write the VMX regs to must be. See the comment in
* sigcontext for more detail.
> + */
> +static elf_vrreg_t __user *sigcontext_vmx_regs(struct sigcontext __user *sc)
> +{
> + return (elf_vrreg_t __user *) (((unsigned long)sc->vmx_reserve + 15) &
> ~0xful);
> +}
This doesn't build for ppc64e_defconfig:
arch/powerpc/kernel/signal_64.c:82:28: error: 'sigcontext_vmx_regs' defined
but not used [-Werror=unused-function]
static elf_vrreg_t __user *sigcontext_vmx_regs(struct sigcontext __user *sc)
^
For now I'll just #ifdef it.
Please do a test build of ppc64e_defconfig in future.
cheers
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