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| author | Chris Metcalf <cmetcalf@tilera.com> | 2013-08-07 21:33:32 +0200 |
|---|---|---|
| committer | Chris Metcalf <cmetcalf@tilera.com> | 2013-08-13 22:26:21 +0200 |
| commit | 4a556f4f56da3110b27e265b79f0e7582115445c (patch) | |
| tree | f5af0b865c867160855e4722b49d7e850dddf944 /arch/tile/include/asm/page.h | |
| parent | tile: support simulator notification for ET_DYN objects (diff) | |
| download | linux-4a556f4f56da3110b27e265b79f0e7582115445c.tar.xz linux-4a556f4f56da3110b27e265b79f0e7582115445c.zip | |
tile: implement gettimeofday() via vDSO
This change creates the framework for vDSO calls, makes the existing
rt_sigreturn() mechanism use it, and adds a fast gettimeofday().
Now that we need to expose the vDSO address to userspace, we add
AT_SYSINFO_EHDR to the set of aux entries provided to userspace.
(You can disable any extra vDSO support by booting with vdso=0,
but the rt_sigreturn vDSO page will still be provided.)
Note that glibc has supported the tile vDSO since release 2.17.
Signed-off-by: Chris Metcalf <cmetcalf@tilera.com>
Diffstat (limited to 'arch/tile/include/asm/page.h')
| -rw-r--r-- | arch/tile/include/asm/page.h | 8 |
1 files changed, 7 insertions, 1 deletions
diff --git a/arch/tile/include/asm/page.h b/arch/tile/include/asm/page.h index dd033a4fd627..b4f96c0024df 100644 --- a/arch/tile/include/asm/page.h +++ b/arch/tile/include/asm/page.h @@ -39,6 +39,12 @@ #define HPAGE_MASK (~(HPAGE_SIZE - 1)) /* + * We do define AT_SYSINFO_EHDR to support vDSO, + * but don't use the gate mechanism. + */ +#define __HAVE_ARCH_GATE_AREA 1 + +/* * If the Kconfig doesn't specify, set a maximum zone order that * is enough so that we can create huge pages from small pages given * the respective sizes of the two page types. See <linux/mmzone.h>. @@ -246,7 +252,7 @@ static inline __attribute_const__ int get_order(unsigned long size) #endif /* __tilegx__ */ -#ifndef __ASSEMBLY__ +#if !defined(__ASSEMBLY__) && !defined(VDSO_BUILD) #ifdef CONFIG_HIGHMEM |