[Xen-devel] [PATCH v3 1/2] fuzz/x86emul: avoid race in link farm rune

[Wei Liu <wei.liu2@xxxxxxxxxx>]

Several `ln -sf` can race with each other and cause error like:

14:43:56 00:07:06 O: ln: cannot remove 'asm': No such file or directory

Provide dedicated targets for soft-linking directories.

Reported-by: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
Signed-off-by: Wei Liu <wei.liu2@xxxxxxxxxx>
---
v3: use pattern matching rule
---
 tools/fuzz/x86_instruction_emulator/Makefile | 12 ++++++++----
 1 file changed, 8 insertions(+), 4 deletions(-)

diff --git a/tools/fuzz/x86_instruction_emulator/Makefile 
b/tools/fuzz/x86_instruction_emulator/Makefile
index fede7e9afd..b0ea31b2b0 100644
--- a/tools/fuzz/x86_instruction_emulator/Makefile
+++ b/tools/fuzz/x86_instruction_emulator/Makefile
@@ -8,11 +8,15 @@ else
 x86-instruction-emulator-fuzzer-all:
 endif
 
-x86_emulate/x86_emulate.c x86_emulate/x86_emulate.h:
-       [ -L x86_emulate ] || ln -sf $(XEN_ROOT)/xen/arch/x86/x86_emulate .
+x86_emulate:
+       [ -L $@ ] || ln -sf $(XEN_ROOT)/xen/arch/x86/$@ .
 
-asm/x86-vendors.h asm/x86-defns.h asm/msr-index.h:
-       [ -L asm ] || ln -sf $(XEN_ROOT)/xen/include/asm-x86 asm
+x86_emulate/x86_emulate.c x86_emulate/x86_emulate.h: x86_emulate
+
+asm:
+       [ -L $@ ] || ln -sf $(XEN_ROOT)/xen/include/asm-x86 $@
+
+asm/%: asm ;
 
 x86_emulate.c x86_emulate.h: %:
        [ -L $* ] || ln -sf $(XEN_ROOT)/tools/tests/x86_emulator/$*
-- 
2.11.0


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