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Thu, 8 Aug 2019 00:57:31 +1000 (AEST) Received: by mail-pl1-x642.google.com with SMTP id k8so41231265plt.3 for ; Wed, 07 Aug 2019 07:57:30 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=fossix-org.20150623.gappssmtp.com; s=20150623; h=from:to:cc:subject:date:message-id:in-reply-to:references :mime-version:content-transfer-encoding; bh=dCjlN6WUVTqi9Ls8DV65kSTfioWg+e5KAofys5HWp+8=; b=KVVHNX5JdgxTMcjfH2tXB/29kUpAfAhrmRoufpzO/vtZ+qISQnJpPJLnpWCoPCzTMN XfnRticIn8zT0uTjjmBEV9iB7ftUuef53x68wIjX4F6D7OwQnzfMyBJvyza0UESjjVN5 0t7qBjnklPraDRg4XG8rqnojS3soobzpNE4PR0V5tJ3MkBLvx8u6pppKqee2H/mz0huX W/kBRB3alG00YfDaJoi3BEVZtip71Afa/UFamFeqwMoLULNzSRXbi3ymWfSG+7XMPJER c3C29nDYU8CTMWY0Vr/k3Haoxl9zrW+zoqLYJPvxXmnM+ge5crRQcBmTdqnDkD5CReHD n6KQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references:mime-version:content-transfer-encoding; bh=dCjlN6WUVTqi9Ls8DV65kSTfioWg+e5KAofys5HWp+8=; b=BxI8sps+zgCvkyXb19BHzx94Gam2zRqo65GAS1I7OXgI7Gb56lDqN/rrf/Pgt+Is9m 0A1Ytfu1lbGJyOgD6QPV1f3CQig+pSnpdeg5gYwi17K1E3OzQU7VfnnaYAJ461gIew72 s3G8TzuzXJSUKgkyrkDpKcgVkWQ3Sfy2tWLFVKA07W6GAqmojZIz089GyTemKGIjlWSO j/W0ZaZk5KAdq+cC2bBBLRD8SAqZWvmnp5FMsPwk8pUI9ILBJQbEo6V4W6eeQg1iBsIz ZH772inteaPt+P/rLjAUvH4LDDGVAI34oKdGFWHD6N1ffYw43iNOQsuAyKbnTAnyxtKB RoRA== X-Gm-Message-State: APjAAAX0ajQjNo2ZpIA9TgF1MFB5Cxolo14oQ6GpNrhhNmJrscfyfA/F adc15cIVGqB22gqhH6GURsbq0NYB39vtrA== X-Google-Smtp-Source: APXvYqwgdGhG+bvstw2uSm2Nqd/uqXQrbMhYKPt9/CeAGqfLRAOLhojclnU6sDuu6tNz/RCahuCq7Q== X-Received: by 2002:a17:902:8490:: with SMTP id c16mr8748173plo.1.1565189849100; Wed, 07 Aug 2019 07:57:29 -0700 (PDT) Received: from santosiv.in.ibm.com.com ([183.82.17.96]) by smtp.gmail.com with ESMTPSA id l4sm93617475pff.50.2019.08.07.07.57.25 (version=TLS1_3 cipher=AEAD-AES256-GCM-SHA384 bits=256/256); Wed, 07 Aug 2019 07:57:28 -0700 (PDT) From: Santosh Sivaraj To: linuxppc-dev , Linux Kernel Subject: [PATCH v8 4/7] extable: Add function to search only kernel exception table Date: Wed, 7 Aug 2019 20:26:57 +0530 Message-Id: <20190807145700.25599-5-santosh@fossix.org> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20190807145700.25599-1-santosh@fossix.org> References: <20190807145700.25599-1-santosh@fossix.org> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit 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: "Aneesh Kumar K.V" , Mahesh Salgaonkar , Nicholas Piggin , Chandan Rajendra , Thomas Gleixner , Reza Arbab , Ingo Molnar Errors-To: linuxppc-dev-bounces+linuxppc-dev=archiver.kernel.org@lists.ozlabs.org Sender: "Linuxppc-dev" Certain architecture specific operating modes (e.g., in powerpc machine check handler that is unable to access vmalloc memory), the search_exception_tables cannot be called because it also searches the module exception tables if entry is not found in the kernel exception table. Cc: Thomas Gleixner Cc: Ingo Molnar Cc: Nicholas Piggin Signed-off-by: Santosh Sivaraj Reviewed-by: Nicholas Piggin --- include/linux/extable.h | 2 ++ kernel/extable.c | 11 +++++++++-- 2 files changed, 11 insertions(+), 2 deletions(-) diff --git a/include/linux/extable.h b/include/linux/extable.h index 41c5b3a25f67..81ecfaa83ad3 100644 --- a/include/linux/extable.h +++ b/include/linux/extable.h @@ -19,6 +19,8 @@ void trim_init_extable(struct module *m); /* Given an address, look for it in the exception tables */ const struct exception_table_entry *search_exception_tables(unsigned long add); +const struct exception_table_entry * +search_kernel_exception_table(unsigned long addr); #ifdef CONFIG_MODULES /* For extable.c to search modules' exception tables. */ diff --git a/kernel/extable.c b/kernel/extable.c index e23cce6e6092..f6c9406eec7d 100644 --- a/kernel/extable.c +++ b/kernel/extable.c @@ -40,13 +40,20 @@ void __init sort_main_extable(void) } } +/* Given an address, look for it in the kernel exception table */ +const +struct exception_table_entry *search_kernel_exception_table(unsigned long addr) +{ + return search_extable(__start___ex_table, + __stop___ex_table - __start___ex_table, addr); +} + /* Given an address, look for it in the exception tables. */ const struct exception_table_entry *search_exception_tables(unsigned long addr) { const struct exception_table_entry *e; - e = search_extable(__start___ex_table, - __stop___ex_table - __start___ex_table, addr); + e = search_kernel_exception_table(addr); if (!e) e = search_module_extables(addr); return e; -- 2.20.1