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https://github.com/AuxXxilium/linux_dsm_epyc7002.git
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726328d92a
This patch updates/fixes all spin_unlock_wait() implementations. The update is in semantics; where it previously was only a control dependency, we now upgrade to a full load-acquire to match the store-release from the spin_unlock() we waited on. This ensures that when spin_unlock_wait() returns, we're guaranteed to observe the full critical section we waited on. This fixes a number of spin_unlock_wait() users that (not unreasonably) rely on this. I also fixed a number of ticket lock versions to only wait on the current lock holder, instead of for a full unlock, as this is sufficient. Furthermore; again for ticket locks; I added an smp_rmb() in between the initial ticket load and the spin loop testing the current value because I could not convince myself the address dependency is sufficient, esp. if the loads are of different sizes. I'm more than happy to remove this smp_rmb() again if people are certain the address dependency does indeed work as expected. Note: PPC32 will be fixed independently Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> Cc: Andrew Morton <akpm@linux-foundation.org> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Paul E. McKenney <paulmck@linux.vnet.ibm.com> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: chris@zankel.net Cc: cmetcalf@mellanox.com Cc: davem@davemloft.net Cc: dhowells@redhat.com Cc: james.hogan@imgtec.com Cc: jejb@parisc-linux.org Cc: linux@armlinux.org.uk Cc: mpe@ellerman.id.au Cc: ralf@linux-mips.org Cc: realmz6@gmail.com Cc: rkuo@codeaurora.org Cc: rth@twiddle.net Cc: schwidefsky@de.ibm.com Cc: tony.luck@intel.com Cc: vgupta@synopsys.com Cc: ysato@users.sourceforge.jp Cc: linux-kernel@vger.kernel.org Signed-off-by: Ingo Molnar <mingo@kernel.org> |
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| .. | ||
| atomic_32.c | ||
| atomic_asm_32.S | ||
| cacheflush.c | ||
| checksum.c | ||
| cpumask.c | ||
| delay.c | ||
| exports.c | ||
| Makefile | ||
| memchr_32.c | ||
| memchr_64.c | ||
| memcpy_32.S | ||
| memcpy_64.c | ||
| memcpy_user_64.c | ||
| memmove.c | ||
| memset_32.c | ||
| memset_64.c | ||
| spinlock_32.c | ||
| spinlock_64.c | ||
| spinlock_common.h | ||
| strchr_32.c | ||
| strchr_64.c | ||
| string-endian.h | ||
| strlen_32.c | ||
| strlen_64.c | ||
| strnlen_32.c | ||
| strnlen_64.c | ||
| uaccess.c | ||
| usercopy_32.S | ||
| usercopy_64.S | ||