path: root/arch/tile/include/asm/compat.h
diff options
authorChris Metcalf <cmetcalf@tilera.com>2013-03-04 11:19:09 -0500
committerChris Metcalf <cmetcalf@tilera.com>2013-03-04 11:19:09 -0500
commit5a114b98661e3aaa0ac085eb931584dce3b0ef9b (patch)
tree375a9103da9b40c1213d3bf78ed25f99c0df8455 /arch/tile/include/asm/compat.h
parent6dbe51c251a327e012439c4772097a13df43c5b8 (diff)
tile: work around bug in the generic sys_llseek
sys_llseek should specify the high and low 32-bit seek values as "unsigned int" but instead it specifies "unsigned long". Since compat syscall arguments are always sign-extended on tile, this means that a seek value of 0xffffffff will be incorrectly interpreted as a value of -1ULL. To avoid the risk of breaking binary compatibility on architectures that already use sys_llseek this way, we follow the same path as MIPS and provide a wrapper override. Signed-off-by: Chris Metcalf <cmetcalf@tilera.com> Cc: stable@kernel.org [v3.6 onwards]
Diffstat (limited to 'arch/tile/include/asm/compat.h')
1 files changed, 3 insertions, 0 deletions
diff --git a/arch/tile/include/asm/compat.h b/arch/tile/include/asm/compat.h
index 001d418a8957..78f1f2ded86c 100644
--- a/arch/tile/include/asm/compat.h
+++ b/arch/tile/include/asm/compat.h
@@ -288,6 +288,9 @@ long compat_sys_sync_file_range2(int fd, unsigned int flags,
long compat_sys_fallocate(int fd, int mode,
u32 offset_lo, u32 offset_hi,
u32 len_lo, u32 len_hi);
+long compat_sys_llseek(unsigned int fd, unsigned int offset_high,
+ unsigned int offset_low, loff_t __user * result,
+ unsigned int origin);
/* Assembly trampoline to avoid clobbering r0. */
long _compat_sys_rt_sigreturn(void);