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47 lines
1.9 KiB
Diff
47 lines
1.9 KiB
Diff
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From 2fb44600fe784449404c6639de26af8361999ec7 Mon Sep 17 00:00:00 2001
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From: Florian Fainelli <f.fainelli@gmail.com>
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Date: Tue, 18 Jul 2017 16:43:47 -0700
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Subject: [PATCH] um: Fix check for _xstate for older hosts
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Commit 0a987645672e ("um: Allow building and running on older
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hosts") attempted to check for PTRACE_{GET,SET}REGSET under the premise
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that these ptrace(2) parameters were directly linked with the presence
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of the _xstate structure.
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After Richard's commit 61e8d462457f ("um: Correctly check for
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PTRACE_GETRESET/SETREGSET") which properly included linux/ptrace.h
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instead of asm/ptrace.h, we could get into the original build failure
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that I reported:
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arch/x86/um/user-offsets.c: In function 'foo':
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arch/x86/um/user-offsets.c:54: error: invalid application of 'sizeof' to
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incomplete type 'struct _xstate'
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On this particular host, we do have PTRACE_GETREGSET and
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PTRACE_SETREGSET defined in linux/ptrace.h, but not the structure
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_xstate that should be pulled from the following include chain: signal.h
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-> bits/sigcontext.h.
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Correctly fix this by checking for FP_XSTATE_MAGIC1 which is the correct
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way to see if struct _xstate is available or not on the host.
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Fixes: 61e8d462457f ("um: Correctly check for PTRACE_GETRESET/SETREGSET")
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Fixes: 0a987645672e ("um: Allow building and running on older hosts")
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Signed-off-by: Florian Fainelli <f.fainelli@gmail.com>
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Signed-off-by: Richard Weinberger <richard@nod.at>
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---
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arch/x86/um/user-offsets.c | 2 +-
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1 file changed, 1 insertion(+), 1 deletion(-)
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--- a/arch/x86/um/user-offsets.c
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+++ b/arch/x86/um/user-offsets.c
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@@ -50,7 +50,7 @@ void foo(void)
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DEFINE(HOST_GS, GS);
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DEFINE(HOST_ORIG_AX, ORIG_EAX);
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#else
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-#if defined(PTRACE_GETREGSET) && defined(PTRACE_SETREGSET)
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+#ifdef FP_XSTATE_MAGIC1
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DEFINE(HOST_FP_SIZE, sizeof(struct _xstate) / sizeof(unsigned long));
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#else
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DEFINE(HOST_FP_SIZE, sizeof(struct _fpstate) / sizeof(unsigned long));
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