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Date: Sun, 20 Apr 2014 19:13:46 -0700 From: Greg Kroah-Hartman <gregkh@...uxfoundation.org> To: linux-kernel@...r.kernel.org Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>, stable@...r.kernel.org, Dave Kleikamp <dave.kleikamp@...cle.com>, Bob Picco <bob.picco@...cle.com>, Allen Pais <allen.pais@...cle.com>, "David S. Miller" <davem@...emloft.net>, sparclinux@...r.kernel.org Subject: [PATCH 3.13 29/32] sparc64: dont treat 64-bit syscall return codes as 32-bit 3.13-stable review patch. If anyone has any objections, please let me know. ------------------ From: Dave Kleikamp <dave.kleikamp@...cle.com> [ Upstream commit 1535bd8adbdedd60a0ee62e28fd5225d66434371 ] When checking a system call return code for an error, linux_sparc_syscall was sign-extending the lower 32-bit value and comparing it to -ERESTART_RESTARTBLOCK. lseek can return valid return codes whose lower 32-bits alone would indicate a failure (such as 4G-1). Use the whole 64-bit value to check for errors. Only the 32-bit path should sign extend the lower 32-bit value. Signed-off-by: Dave Kleikamp <dave.kleikamp@...cle.com> Acked-by: Bob Picco <bob.picco@...cle.com> Acked-by: Allen Pais <allen.pais@...cle.com> Cc: David S. Miller <davem@...emloft.net> Cc: sparclinux@...r.kernel.org Signed-off-by: David S. Miller <davem@...emloft.net> Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org> --- arch/sparc/kernel/syscalls.S | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) --- a/arch/sparc/kernel/syscalls.S +++ b/arch/sparc/kernel/syscalls.S @@ -189,7 +189,8 @@ linux_sparc_syscall32: mov %i0, %l5 ! IEU1 5: call %l7 ! CTI Group brk forced srl %i5, 0, %o5 ! IEU1 - ba,a,pt %xcc, 3f + ba,pt %xcc, 3f + sra %o0, 0, %o0 /* Linux native system calls enter here... */ .align 32 @@ -217,7 +218,6 @@ linux_sparc_syscall: 3: stx %o0, [%sp + PTREGS_OFF + PT_V9_I0] ret_sys_call: ldx [%sp + PTREGS_OFF + PT_V9_TSTATE], %g3 - sra %o0, 0, %o0 mov %ulo(TSTATE_XCARRY | TSTATE_ICARRY), %g2 sllx %g2, 32, %g2 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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