From patchwork Sat Sep 19 09:18:04 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Thomas Gleixner X-Patchwork-Id: 1367544 Return-Path: X-Original-To: patchwork-incoming@ozlabs.org Delivered-To: patchwork-incoming@ozlabs.org Received: from lists.ozlabs.org (lists.ozlabs.org [203.11.71.2]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (4096 bits)) (No client certificate requested) by ozlabs.org (Postfix) with ESMTPS id 4Btmkw57ksz9sT6 for ; Sat, 19 Sep 2020 20:14:00 +1000 (AEST) Authentication-Results: ozlabs.org; dmarc=fail (p=none dis=none) header.from=linutronix.de Authentication-Results: ozlabs.org; dkim=fail reason="signature verification failed" (2048-bit key; secure) header.d=linutronix.de header.i=@linutronix.de header.a=rsa-sha256 header.s=2020 header.b=2FnY2CgY; dkim=fail reason="signature verification failed" header.d=linutronix.de header.i=@linutronix.de header.a=ed25519-sha256 header.s=2020e header.b=fMUgmEzq; dkim-atps=neutral Received: from bilbo.ozlabs.org (lists.ozlabs.org [IPv6:2401:3900:2:1::3]) by lists.ozlabs.org (Postfix) with ESMTP id 4Btmkw2MFrzDr9w for ; Sat, 19 Sep 2020 20:14:00 +1000 (AEST) X-Original-To: linuxppc-dev@lists.ozlabs.org Delivered-To: linuxppc-dev@lists.ozlabs.org Authentication-Results: lists.ozlabs.org; spf=pass (sender SPF authorized) smtp.mailfrom=linutronix.de (client-ip=2a0a:51c0:0:12e:550::1; helo=galois.linutronix.de; envelope-from=tglx@linutronix.de; receiver=) Authentication-Results: lists.ozlabs.org; dmarc=pass (p=none dis=none) header.from=linutronix.de Authentication-Results: lists.ozlabs.org; dkim=pass (2048-bit key; secure) header.d=linutronix.de header.i=@linutronix.de header.a=rsa-sha256 header.s=2020 header.b=2FnY2CgY; dkim=pass header.d=linutronix.de header.i=@linutronix.de header.a=ed25519-sha256 header.s=2020e header.b=fMUgmEzq; dkim-atps=neutral Received: from galois.linutronix.de (Galois.linutronix.de [IPv6:2a0a:51c0:0:12e:550::1]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (2048 bits) server-digest SHA256) (No client certificate requested) by lists.ozlabs.org (Postfix) with ESMTPS id 4BtmCg0WWPzDqf1 for ; Sat, 19 Sep 2020 19:50:23 +1000 (AEST) Message-Id: <20200919092617.183860899@linutronix.de> DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linutronix.de; s=2020; t=1600509016; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: references:references; bh=T76OE0hi3eXJr7P+BXpYE0pYDTNZ2r9R3SGulCeyUuU=; b=2FnY2CgYWeCTW79kyvYexk7YWJ5xeg5RXZtJ9x9zc2OPN3Abm6p3LWSqAACGBBqDpxCXEK AmJNM9ROty5cv5zC8ZMPGQFlgo5ozfsX3aCrBpUMsRRmNlSxk2Nb7ibaVsStTHAV+q1xhw tyuUzA8HGEbMNGj37Qb4z+s6kZ5dVfT/fSBG8UTTSfIo/dViyeIUoDNoqWM41jUb1uRe8y TNuoicaGFBrepBDOjFrsE5pU2M0/QYOnyyCI8Na1YuZRUl8nzPl97OPAYFEckcN1cPy7c7 tnTLXhL0lRIQLAXZHDTRcAsRcj8SYlsXc5v1Qks/4q2bDcL1VWyRREvxbaGmYw== DKIM-Signature: v=1; a=ed25519-sha256; c=relaxed/relaxed; d=linutronix.de; s=2020e; t=1600509016; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: references:references; bh=T76OE0hi3eXJr7P+BXpYE0pYDTNZ2r9R3SGulCeyUuU=; b=fMUgmEzq+EZqCAGQZdywecGad01pST+RaIL5AkSyisvyVygac32pLGfvQZhYYgbpit1xXp 4d6YjSdh1O9XNzCw== Date: Sat, 19 Sep 2020 11:18:04 +0200 From: Thomas Gleixner To: LKML Subject: [patch RFC 13/15] mm/highmem: Remove the old kmap_atomic cruft References: <20200919091751.011116649@linutronix.de> MIME-Version: 1.0 Content-transfer-encoding: 8-bit X-BeenThere: linuxppc-dev@lists.ozlabs.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Linux on PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Juri Lelli , Peter Zijlstra , Sebastian Andrzej Siewior , Joonas Lahtinen , dri-devel , Ben Segall , Max Filippov , Guo Ren , sparclinux@vger.kernel.org, Vincent Chen , Will Deacon , Ard Biesheuvel , linux-arch@vger.kernel.org, Vincent Guittot , Herbert Xu , x86@kernel.org, Russell King , linux-csky@vger.kernel.org, David Airlie , Mel Gorman , linux-snps-arc@lists.infradead.org, linux-xtensa@linux-xtensa.org, Paul McKenney , intel-gfx , linuxppc-dev@lists.ozlabs.org, Steven Rostedt , Linus Torvalds , Jani Nikula , Rodrigo Vivi , Dietmar Eggemann , Linux ARM , Chris Zankel , Michal Simek , Thomas Bogendoerfer , Nick Hu , Linux-MM , Vineet Gupta , linux-mips@vger.kernel.org, Arnd Bergmann , Daniel Vetter , Paul Mackerras , Andrew Morton , Daniel Bristot de Oliveira , "David S. Miller" , Greentime Hu Errors-To: linuxppc-dev-bounces+patchwork-incoming=ozlabs.org@lists.ozlabs.org Sender: "Linuxppc-dev" Signed-off-by: Thomas Gleixner --- include/linux/highmem.h | 65 ++---------------------------------------------- mm/highmem.c | 28 +++++++++++++++++--- 2 files changed, 28 insertions(+), 65 deletions(-) --- a/include/linux/highmem.h +++ b/include/linux/highmem.h @@ -94,27 +94,6 @@ static inline void kunmap(struct page *p * be used in IRQ contexts, so in some (very limited) cases we need * it. */ - -#ifndef CONFIG_KMAP_ATOMIC_GENERIC -void *kmap_atomic_high_prot(struct page *page, pgprot_t prot); -void kunmap_atomic_high(void *kvaddr); - -static inline void *kmap_atomic_prot(struct page *page, pgprot_t prot) -{ - preempt_disable(); - pagefault_disable(); - if (!PageHighMem(page)) - return page_address(page); - return kmap_atomic_high_prot(page, prot); -} - -static inline void __kunmap_atomic(void *vaddr) -{ - kunmap_atomic_high(vaddr); - pagefault_enable(); -} -#else /* !CONFIG_KMAP_ATOMIC_GENERIC */ - static inline void *kmap_atomic_prot(struct page *page, pgprot_t prot) { preempt_disable(); @@ -127,17 +106,14 @@ static inline void *kmap_atomic_pfn(unsi return kmap_atomic_pfn_prot(pfn, kmap_prot); } -static inline void __kunmap_atomic(void *addr) +static inline void *kmap_atomic(struct page *page) { - kumap_atomic_indexed(addr); + return kmap_atomic_prot(page, kmap_prot); } - -#endif /* CONFIG_KMAP_ATOMIC_GENERIC */ - -static inline void *kmap_atomic(struct page *page) +static inline void __kunmap_atomic(void *addr) { - return kmap_atomic_prot(page, kmap_prot); + kumap_atomic_indexed(addr); } /* declarations for linux/mm/highmem.c */ @@ -233,39 +209,6 @@ static inline void __kunmap_atomic(void #endif /* CONFIG_HIGHMEM */ -#if defined(CONFIG_HIGHMEM) || defined(CONFIG_X86_32) - -DECLARE_PER_CPU(int, __kmap_atomic_idx); - -static inline int kmap_atomic_idx_push(void) -{ - int idx = __this_cpu_inc_return(__kmap_atomic_idx) - 1; - -#ifdef CONFIG_DEBUG_HIGHMEM - WARN_ON_ONCE(in_irq() && !irqs_disabled()); - BUG_ON(idx >= KM_TYPE_NR); -#endif - return idx; -} - -static inline int kmap_atomic_idx(void) -{ - return __this_cpu_read(__kmap_atomic_idx) - 1; -} - -static inline void kmap_atomic_idx_pop(void) -{ -#ifdef CONFIG_DEBUG_HIGHMEM - int idx = __this_cpu_dec_return(__kmap_atomic_idx); - - BUG_ON(idx < 0); -#else - __this_cpu_dec(__kmap_atomic_idx); -#endif -} - -#endif - /* * Prevent people trying to call kunmap_atomic() as if it were kunmap() * kunmap_atomic() should get the return value of kmap_atomic, not the page. --- a/mm/highmem.c +++ b/mm/highmem.c @@ -31,10 +31,6 @@ #include #include -#if defined(CONFIG_HIGHMEM) || defined(CONFIG_X86_32) -DEFINE_PER_CPU(int, __kmap_atomic_idx); -#endif - /* * Virtual_count is not a pure "count". * 0 means that it is not mapped, and has not been mapped @@ -380,6 +376,30 @@ static inline void kmap_high_unmap_tempo #endif /* CONFIG_HIGHMEM */ #ifdef CONFIG_KMAP_ATOMIC_GENERIC + +static DEFINE_PER_CPU(int, __kmap_atomic_idx); + +static inline int kmap_atomic_idx_push(void) +{ + int idx = __this_cpu_inc_return(__kmap_atomic_idx) - 1; + + WARN_ON_ONCE(in_irq() && !irqs_disabled()); + BUG_ON(idx >= KM_TYPE_NR); + return idx; +} + +static inline int kmap_atomic_idx(void) +{ + return __this_cpu_read(__kmap_atomic_idx) - 1; +} + +static inline void kmap_atomic_idx_pop(void) +{ + int idx = __this_cpu_dec_return(__kmap_atomic_idx); + + BUG_ON(idx < 0); +} + #ifndef arch_kmap_temp_post_map # define arch_kmap_temp_post_map(vaddr, pteval) do { } while (0) #endif