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android_kernel_xiaomi_sm7250/arch/riscv
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Waiman Long 72ed1d5634 BACKPORT: locking/rwsem: Remove rwsem-spinlock.c & use rwsem-xadd.c for all archs 
Currently, we have two different implementation of rwsem:

 1) CONFIG_RWSEM_GENERIC_SPINLOCK (rwsem-spinlock.c)
 2) CONFIG_RWSEM_XCHGADD_ALGORITHM (rwsem-xadd.c)

As we are going to use a single generic implementation for rwsem-xadd.c
and no architecture-specific code will be needed, there is no point
in keeping two different implementations of rwsem. In most cases, the
performance of rwsem-spinlock.c will be worse. It also doesn't get all
the performance tuning and optimizations that had been implemented in
rwsem-xadd.c over the years.

For simplication, we are going to remove rwsem-spinlock.c and make all
architectures use a single implementation of rwsem - rwsem-xadd.c.

All references to RWSEM_GENERIC_SPINLOCK and RWSEM_XCHGADD_ALGORITHM
in the code are removed.

Suggested-by: Peter Zijlstra <peterz@infradead.org>
Signed-off-by: Waiman Long <longman@redhat.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Acked-by: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Arnd Bergmann <arnd@arndb.de>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Davidlohr Bueso <dave@stgolabs.net>
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Tim Chen <tim.c.chen@linux.intel.com>
Cc: Will Deacon <will.deacon@arm.com>
Cc: linux-arm-kernel@lists.infradead.org
Cc: linux-c6x-dev@linux-c6x.org
Cc: linux-m68k@lists.linux-m68k.org
Cc: linux-riscv@lists.infradead.org
Cc: linux-um@lists.infradead.org
Cc: linux-xtensa@linux-xtensa.org
Cc: linuxppc-dev@lists.ozlabs.org
Cc: nios2-dev@lists.rocketboards.org
Cc: openrisc@lists.librecores.org
Cc: uclinux-h8-devel@lists.sourceforge.jp
Link: https://lkml.kernel.org/r/20190322143008.21313-3-longman@redhat.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Change-Id: I8a94de8b29db44da529ccbb90dc591efa06906c7
Signed-off-by: UtsavBalar1231 <utsavbalar1231@gmail.com>
2022-11-12 11:23:32 +00:00
..
configs irqchip: add a SiFive PLIC driver 2018-08-13 08:31:32 -07:00
include UPSTREAM: asm-generic/tlb, arch: Provide generic tlb_flush() based on flush_tlb_range() 2022-11-12 11:23:04 +00:00
kernel riscv: Allow PROT_WRITE-only mmap() 2022-10-26 13:19:21 +02:00
lib riscv: Fix udelay in RV32. 2019-07-14 08:11:09 +02:00
mm RISC-V: Avoid corrupting the upper 32-bit of phys_addr_t in ioremap 2019-12-01 09:16:53 +01:00
Kconfig BACKPORT: locking/rwsem: Remove rwsem-spinlock.c & use rwsem-xadd.c for all archs 2022-11-12 11:23:32 +00:00
Kconfig.debug Kconfig: consolidate the "Kernel hacking" menu 2018-08-02 08:06:48 +09:00
Makefile riscv: fix build with binutils 2.38 2022-10-26 13:19:22 +02:00