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The patch originally submitted corrected behaviour on s390 and s390x.
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The i686 change was added in order to maintain parity.
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Author: Stefan Liebler <stli@linux.vnet.ibm.com>
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Index: b/sysdeps/unix/sysv/linux/s390/s390-32/socket.S
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===================================================================
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--- a/sysdeps/unix/sysv/linux/s390/s390-32/socket.S
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+++ b/sysdeps/unix/sysv/linux/s390/s390-32/socket.S
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@@ -99,8 +99,8 @@ ENTRY(__socket)
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l %r15,0(0,%r15) /* load back chain */
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lm %r6,15,24(%r15) /* load registers */
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- /* gpr2 is < 0 if there was an error. */
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- lhi %r0,-125
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+ /* gpr2 is in [-4095, -1] if there was an error. */
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+ lhi %r0,-4095
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clr %r2,%r0
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jnl SYSCALL_ERROR_LABEL
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Index: b/sysdeps/unix/sysv/linux/s390/s390-64/socket.S
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===================================================================
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--- a/sysdeps/unix/sysv/linux/s390/s390-64/socket.S
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+++ b/sysdeps/unix/sysv/linux/s390/s390-64/socket.S
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@@ -99,8 +99,8 @@ ENTRY(__socket)
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lg %r15,0(%r15) /* Load back chain. */
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lmg %r6,15,48(%r15) /* Load registers. */
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- /* gpr2 is < 0 if there was an error. */
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- lghi %r0,-125
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+ /* gpr2 is in [-4095, -1] if there was an error. */
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+ lghi %r0,-4095
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clgr %r2,%r0
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jgnl SYSCALL_ERROR_LABEL
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Index: b/sysdeps/unix/sysv/linux/i386/socket.S
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===================================================================
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--- a/sysdeps/unix/sysv/linux/i386/socket.S
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+++ b/sysdeps/unix/sysv/linux/i386/socket.S
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@@ -63,8 +63,8 @@ ENTRY (__socket)
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movl %edx, %ebx
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cfi_restore (3)
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- /* %eax is < 0 if there was an error. */
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- cmpl $-125, %eax
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+ /* %eax is in [-4095, -1] if there was an error. */
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+ cmpl $-4095, %eax
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jae SYSCALL_ERROR_LABEL
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/* Successful; return the syscall's value. */
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@@ -108,8 +108,8 @@ ENTRY (__socket)
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cfi_restore (6)
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cfi_adjust_cfa_offset(-4)
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- /* %eax is < 0 if there was an error. */
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- cmpl $-125, %eax
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+ /* %eax is in [-4095, -1] if there was an error. */
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+ cmpl $-4095, %eax
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jae SYSCALL_ERROR_LABEL
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/* Successful; return the syscall's value. */
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