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24b8a23638
It happens to work, but it's very very wrong, because our 'current'
macro is magic that is supposedly loading a stable value.
It just happens to be not quite stable enough and the compilers
re-load the value enough for this code to work. But it's wrong.
The whole
struct fpu *prev_fpu = &prev->fpu;
thing in __switch_to() is pretty ugly. There's no reason why we
should look at that 'prev_fpu' pointer there, or pass it down.
And it only generates worse code, in how it loads 'current' when
__switch_to() has the right task pointers.
The attached patch not only cleans this up, it actually
generates better code too:
(a) it removes one push/pop pair at entry/exit because there's one
less register used (no 'current')
(b) it removes that pointless load of 'current' because it just uses
the right argument:
- movq %gs:pcpu_hot(%rip), %r12
- testq $16384, (%r12)
+ testq $16384, (%rdi)
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Uros Bizjak <ubizjak@gmail.com>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Link: https://lore.kernel.org/r/20231018184227.446318-1-ubizjak@gmail.com
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| Makefile_32.cpu | ||
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