kernel/git/stable/linux.git/arch/csky, branch linux-5.12.y

csky: syscache: Fixup duplicate cache flush

2021-07-14T15:00:29+00:00

[ Upstream commit 6ea42c84f33368eb3fe1ec1bff8d7cb1a5c7b07a ] The current csky logic of sys_cacheflush is wrong, it'll cause icache flush call dcache flush again. Now fixup it with a conditional "break & fallthrough". Fixes: 997153b9a75c ("csky: Add flush_icache_mm to defer flush icache all") Fixes: 0679d29d3e23 ("csky: fix syscache.c fallthrough warning") Acked-by: Randy Dunlap Co-Developed-by: Randy Dunlap Signed-off-by: Guo Ren Cc: Arnd Bergmann Signed-off-by: Sasha Levin

csky: fix syscache.c fallthrough warning

2021-07-14T15:00:29+00:00

[ Upstream commit 0679d29d3e2351a1c3049c26a63ce1959cad5447 ] This case of the switch statement falls through to the following case. This appears to be on purpose, so declare it as OK. ../arch/csky/mm/syscache.c: In function '__do_sys_cacheflush': ../arch/csky/mm/syscache.c:17:3: warning: this statement may fall through [-Wimplicit-fallthrough=] 17 | flush_icache_mm_range(current->mm, | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ 18 | (unsigned long)addr, | ~~~~~~~~~~~~~~~~~~~~ 19 | (unsigned long)addr + bytes); | ~~~~~~~~~~~~~~~~~~~~~~~~~~~~ ../arch/csky/mm/syscache.c:20:2: note: here 20 | case DCACHE: | ^~~~ Fixes: 997153b9a75c ("csky: Add flush_icache_mm to defer flush icache all") Signed-off-by: Randy Dunlap Signed-off-by: Guo Ren Cc: linux-csky@vger.kernel.org Cc: Arnd Bergmann Signed-off-by: Sasha Levin

sched/core: Initialize the idle task with preemption disabled

2021-07-14T14:59:16+00:00

[ Upstream commit f1a0a376ca0c4ef1fc3d24e3e502acbb5b795674 ] As pointed out by commit de9b8f5dcbd9 ("sched: Fix crash trying to dequeue/enqueue the idle thread") init_idle() can and will be invoked more than once on the same idle task. At boot time, it is invoked for the boot CPU thread by sched_init(). Then smp_init() creates the threads for all the secondary CPUs and invokes init_idle() on them. As the hotplug machinery brings the secondaries to life, it will issue calls to idle_thread_get(), which itself invokes init_idle() yet again. In this case it's invoked twice more per secondary: at _cpu_up(), and at bringup_cpu(). Given smp_init() already initializes the idle tasks for all *possible* CPUs, no further initialization should be required. Now, removing init_idle() from idle_thread_get() exposes some interesting expectations with regards to the idle task's preempt_count: the secondary startup always issues a preempt_disable(), requiring some reset of the preempt count to 0 between hot-unplug and hotplug, which is currently served by idle_thread_get() -> idle_init(). Given the idle task is supposed to have preemption disabled once and never see it re-enabled, it seems that what we actually want is to initialize its preempt_count to PREEMPT_DISABLED and leave it there. Do that, and remove init_idle() from idle_thread_get(). Secondary startups were patched via coccinelle: @begone@ @@ -preempt_disable(); ... cpu_startup_entry(CPUHP_AP_ONLINE_IDLE); Signed-off-by: Valentin Schneider Signed-off-by: Ingo Molnar Acked-by: Peter Zijlstra Link: https://lore.kernel.org/r/20210512094636.2958515-1-valentin.schneider@arm.com Signed-off-by: Sasha Levin

csky: change a Kconfig symbol name to fix e1000 build error

2021-04-16T23:10:36+00:00

e1000's #define of CONFIG_RAM_BASE conflicts with a Kconfig symbol in arch/csky/Kconfig. The symbol in e1000 has been around longer, so change arch/csky/ to use DRAM_BASE instead of RAM_BASE to remove the conflict. (although e1000 is also a 2-line change) Link: https://lkml.kernel.org/r/20210411055335.7111-1-rdunlap@infradead.org Signed-off-by: Randy Dunlap Reported-by: kernel test robot Acked-by: Guo Ren Cc: Jesse Brandeburg Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds

ftrace: Fix spelling mistake "disabed" -> "disabled"

2021-03-17T04:19:40+00:00

There is a spelling mistake in a comment, fix it. Signed-off-by: Colin Ian King Signed-off-by: Palmer Dabbelt

Merge tag 'csky-for-linus-5.12-rc1' of git://github.com/c-sky/csky-linux

2021-02-28T20:06:45+00:00

Pull arch/csky updates from Guo Ren: "Features: - add new memory layout 2.5G(user):1.5G(kernel) - add kmemleak support - reconstruct VDSO framework: add VDSO with GENERIC_GETTIMEOFDAY, GENERIC_TIME_VSYSCALL, HAVE_GENERIC_VDSO - add faulthandler_disabled() check - support (fix) swapon - add (fix) _PAGE_ACCESSED for default pgprot - abort uaccess retries upon fatal signal (from arm) Fixes and optimizations: - fix perf probe failure - fix show_regs doesn't contain regs->usp - remove custom asm/atomic.h implementation - fix barrier design - fix futex SMP implementation - fix asm/cmpxchg.h with correct ordering barrier - cleanup asm/spinlock.h - fix PTE global for 2.5:1.5 virtual memory - remove prologue of page fault handler in entry.S - fix TLB maintenance synchronization problem - add show_tlb for CPU_CK860 debug - fix FAULT_FLAG_XXX param for handle_mm_fault - fix update_mmu_cache called with user io mapping - fix do_page_fault parent irq status - fix a size determination in gpr_get() - pgtable.h: Coding convention - kprobe: Fix code in simulate without 'long' - fix pfn_valid error with wrong max_mapnr - use free_initmem_default() in free_initmem() - fix compile error" * tag 'csky-for-linus-5.12-rc1' of git://github.com/c-sky/csky-linux: (30 commits) csky: Fixup compile error csky: use free_initmem_default() in free_initmem() csky: Fixup pfn_valid error with wrong max_mapnr csky: Add VDSO with GENERIC_GETTIMEOFDAY, GENERIC_TIME_VSYSCALL, HAVE_GENERIC_VDSO csky: kprobe: Fixup code in simulate without 'long' csky: Fixup swapon csky: pgtable.h: Coding convention csky: Fixup _PAGE_ACCESSED for default pgprot csky: remove unused including csky: Fix a size determination in gpr_get() csky: Reconstruct VDSO framework csky: mm: abort uaccess retries upon fatal signal csky: Sync riscv mm/fault.c for easy maintenance csky: Fixup do_page_fault parent irq status csky: Add faulthandler_disabled() check csky: Fixup update_mmu_cache called with user io mapping csky: Fixup FAULT_FLAG_XXX param for handle_mm_fault csky: Add show_tlb for CPU_CK860 debug csky: Fix TLB maintenance synchronization problem csky: Add kmemleak support ...

csky: Fixup compile error

2021-02-27T14:04:14+00:00

csky: use free_initmem_default() in free_initmem()

2021-02-27T08:35:09+00:00

The existing code is essentially free_initmem_default()->free_reserved_area() without poisoning. Note that existing code missed to update the managed page count of the zone. Cc: Andrew Morton Cc: Mike Rapoport Cc: Oscar Salvador Cc: Michal Hocko Cc: Wei Yang Tested-by: Guo Ren Signed-off-by: Guo Ren Signed-off-by: David Hildenbrand

csky: Fixup pfn_valid error with wrong max_mapnr

2021-02-27T08:35:09+00:00

The max_mapnr is the number of PFNs, not absolute PFN offset. Using set_max_mapnr API instead of setting the value directly. Signed-off-by: Guo Ren

csky: Add VDSO with GENERIC_GETTIMEOFDAY, GENERIC_TIME_VSYSCALL, HAVE_GENERIC_VDSO

2021-02-27T08:35:09+00:00

It could help to reduce the latency of the time-related functions in user space. We have referenced arm's and riscv's implementation for the patch. Signed-off-by: Guo Ren Cc: Vincent Chen Cc: Arnd Bergmann