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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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6
arch/um/os-Linux/sigio.c
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@@ -132,7 +132,7 @@ static void update_thread(void)
int n;
char c;
flags = set_signals(0);
flags = set_signals_trace(0);
CATCH_EINTR(n = write(sigio_private[0], &c, sizeof(c)));
if (n != sizeof(c)) {
printk(UM_KERN_ERR "update_thread : write failed, err = %d\n",
@@ -147,7 +147,7 @@ static void update_thread(void)
goto fail;
}
set_signals(flags);
set_signals_trace(flags);
return;
fail:
/* Critical section start */
@@ -161,7 +161,7 @@ static void update_thread(void)
close(write_sigio_fds[0]);
close(write_sigio_fds[1]);
/* Critical section end */
set_signals(flags);
set_signals_trace(flags);
}
int add_sigio_fd(int fd)