netdev - [patch 18/35] net: vxge: Remove in

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives
Hash Suite: Windows password security audit tool. GUI, reports in PDF.
[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]
Date:   Sun, 27 Sep 2020 21:49:04 +0200
From:   Thomas Gleixner <tglx@...utronix.de>
To:     LKML <linux-kernel@...r.kernel.org>
Cc:     Peter Zijlstra <peterz@...radead.org>,
        Linus Torvalds <torvalds@...uxfoundation.org>,
        Paul McKenney <paulmck@...nel.org>,
        Matthew Wilcox <willy@...radead.org>,
        Sebastian Andrzej Siewior <bigeasy@...utronix.de>,
        Jon Mason <jdmason@...zu.us>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>, netdev@...r.kernel.org,
        Christian Benvenuti <benve@...co.com>,
        Govindarajulu Varadarajan <_govind@....com>,
        Dave Miller <davem@...emloft.net>,
        Jonathan Corbet <corbet@....net>,
        Mauro Carvalho Chehab <mchehab+huawei@...nel.org>,
        linux-doc@...r.kernel.org,
        Luc Van Oostenryck <luc.vanoostenryck@...il.com>,
        Jay Cliburn <jcliburn@...il.com>,
        Chris Snook <chris.snook@...il.com>,
        Vishal Kulkarni <vishal@...lsio.com>,
        Jeff Kirsher <jeffrey.t.kirsher@...el.com>,
        intel-wired-lan@...ts.osuosl.org,
        Shannon Nelson <snelson@...sando.io>,
        Pensando Drivers <drivers@...sando.io>,
        Andrew Lunn <andrew@...n.ch>,
        Heiner Kallweit <hkallweit1@...il.com>,
        Russell King <linux@...linux.org.uk>,
        Thomas Bogendoerfer <tsbogend@...ha.franken.de>,
        Solarflare linux maintainers <linux-net-drivers@...arflare.com>,
        Edward Cree <ecree@...arflare.com>,
        Martin Habets <mhabets@...arflare.com>,
        Daniel Drake <dsd@...too.org>,
        Ulrich Kunitz <kune@...ne-taler.de>,
        Kalle Valo <kvalo@...eaurora.org>,
        linux-wireless@...r.kernel.org, linux-usb@...r.kernel.org,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Arend van Spriel <arend.vanspriel@...adcom.com>,
        Franky Lin <franky.lin@...adcom.com>,
        Hante Meuleman <hante.meuleman@...adcom.com>,
        Chi-Hsien Lin <chi-hsien.lin@...ress.com>,
        Wright Feng <wright.feng@...ress.com>,
        brcm80211-dev-list.pdl@...adcom.com,
        brcm80211-dev-list@...ress.com,
        Stanislav Yakovlev <stas.yakovlev@...il.com>,
        Stanislaw Gruszka <stf_xl@...pl>,
        Johannes Berg <johannes.berg@...el.com>,
        Emmanuel Grumbach <emmanuel.grumbach@...el.com>,
        Luca Coelho <luciano.coelho@...el.com>,
        Intel Linux Wireless <linuxwifi@...el.com>,
        Jouni Malinen <j@...fi>,
        Amitkumar Karwar <amitkarwar@...il.com>,
        Ganapathi Bhat <ganapathi.bhat@....com>,
        Xinming Hu <huxinming820@...il.com>,
        libertas-dev@...ts.infradead.org,
        Pascal Terjan <pterjan@...gle.com>,
        Ping-Ke Shih <pkshih@...ltek.com>
Subject: [patch 18/35] net: vxge: Remove in_interrupt() conditionals

From: Sebastian Andrzej Siewior <bigeasy@...utronix.de>

vxge_os_dma_malloc() and vxge_os_dma_malloc_async() are both called from
callchains which use GFP_KERNEL allocations unconditionally or have other
requirements to be called from fully preemptible task context..

vxge_os_dma_malloc():
  1)  __vxge_hw_blockpool_create() <- GFP_KERNEL
	
  2)  __vxge_hw_mempool_grow() <- vzalloc()
        __vxge_hw_blockpool_malloc()

vxge_os_dma_malloc_async():
  1  __vxge_hw_mempool_grow() <- vzalloc()
      __vxge_hw_blockpool_malloc()
	__vxge_hw_blockpool_blocks_add()

  2)  vxge_hw_vpath_open()	<- vzalloc()
	__vxge_hw_blockpool_block_allocate()

That means neither of these functions needs a conditional allocation mode.

Remove the in_interrupt() conditional and use GFP_KERNEL.

Signed-off-by: Sebastian Andrzej Siewior <bigeasy@...utronix.de>
Signed-off-by: Thomas Gleixner <tglx@...utronix.de>
Cc: Jon Mason <jdmason@...zu.us>
Cc: "David S. Miller" <davem@...emloft.net>
Cc: Jakub Kicinski <kuba@...nel.org>
Cc: netdev@...r.kernel.org

---
 drivers/net/ethernet/neterion/vxge/vxge-config.c |    9 +--------
 drivers/net/ethernet/neterion/vxge/vxge-config.h |    7 +------
 2 files changed, 2 insertions(+), 14 deletions(-)

--- a/drivers/net/ethernet/neterion/vxge/vxge-config.c
+++ b/drivers/net/ethernet/neterion/vxge/vxge-config.c
@@ -2303,16 +2303,9 @@ static void vxge_hw_blockpool_block_add(
 static inline void
 vxge_os_dma_malloc_async(struct pci_dev *pdev, void *devh, unsigned long size)
 {
-	gfp_t flags;
 	void *vaddr;
 
-	if (in_interrupt())
-		flags = GFP_ATOMIC | GFP_DMA;
-	else
-		flags = GFP_KERNEL | GFP_DMA;
-
-	vaddr = kmalloc((size), flags);
-
+	vaddr = kmalloc(size, GFP_KERNEL | GFP_DMA);
 	vxge_hw_blockpool_block_add(devh, vaddr, size, pdev, pdev);
 }
 
--- a/drivers/net/ethernet/neterion/vxge/vxge-config.h
+++ b/drivers/net/ethernet/neterion/vxge/vxge-config.h
@@ -1899,18 +1899,13 @@ static inline void *vxge_os_dma_malloc(s
 			struct pci_dev **p_dmah,
 			struct pci_dev **p_dma_acch)
 {
-	gfp_t flags;
 	void *vaddr;
 	unsigned long misaligned = 0;
 	int realloc_flag = 0;
 	*p_dma_acch = *p_dmah = NULL;
 
-	if (in_interrupt())
-		flags = GFP_ATOMIC | GFP_DMA;
-	else
-		flags = GFP_KERNEL | GFP_DMA;
 realloc:
-	vaddr = kmalloc((size), flags);
+	vaddr = kmalloc(size, GFP_KERNEL | GFP_DMA);
 	if (vaddr == NULL)
 		return vaddr;
 	misaligned = (unsigned long)VXGE_ALIGN((unsigned long)vaddr,