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um: Implement TRACE_IRQFLAGS_SUPPORT

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UML enables TRACE_IRQFLAGS_SUPPORT but doesn't actually implement
it. It seems to have been added for lockdep support, but that can't
actually really work well without IRQ flags tracing, as is also
very noisily reported when enabling CONFIG_DEBUG_LOCKDEP.

Implement it now.

Fixes: 711553efa5 ("[PATCH] uml: declare in Kconfig our partial LOCKDEP support")
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: Richard Weinberger <richard@nod.at>
This commit is contained in:
Johannes Berg
2019-08-23 13:16:23 +02:00
committed by Richard Weinberger
parent 276d75c4af
commit 0dafcbe128
9 changed files with 81 additions and 26 deletions
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2
arch/um/include/shared/longjmp.h
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@@ -18,7 +18,7 @@ extern void longjmp(jmp_buf, int);
enable = get_signals(); \
n = setjmp(*buf); \
if(n != 0) \
set_signals(enable); \
set_signals_trace(enable); \
n; })
#endif

7
arch/um/include/shared/os.h
View File

@@ -232,6 +232,7 @@ extern void block_signals(void);
extern void unblock_signals(void);
extern int get_signals(void);
extern int set_signals(int enable);
extern int set_signals_trace(int enable);
extern int os_is_signal_stack(void);
extern void deliver_alarm(void);
@@ -317,4 +318,10 @@ extern unsigned long os_get_top_address(void);
long syscall(long number, ...);
/* irqflags tracing */
extern void block_signals_trace(void);
extern void unblock_signals_trace(void);
extern void um_trace_signals_on(void);
extern void um_trace_signals_off(void);
#endif