linux-kernel - [RFC V2 1/3] ACPI: add support for sentinel-delimited probe tables

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Date:   Fri, 22 Jun 2018 15:46:30 -0400
From:   Agustin Vega-Frias <agustinv@...eaurora.org>
To:     linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-acpi@...r.kernel.org, Will Deacon <will.deacon@....com>,
        Mark Rutland <mark.rutland@....com>,
        Jeremy Linton <jeremy.linton@....com>,
        Catalin Marinas <catalin.marinas@....com>,
        Marc Zyngier <marc.zyngier@....com>,
        Lorenzo Pieralisi <lorenzo.pieralisi@....com>,
        "Rafael J. Wysocki" <rafael@...nel.org>
Cc:     timur@...eaurora.org, agustinv@...eaurora.org
Subject: [RFC V2 1/3] ACPI: add support for sentinel-delimited probe tables

Tables declared with the ACPI_PROBE_TABLE linker macro are typically
traversed by using the start and end symbols created by the linker
script. However, there are some APIs that use sentinel-delimited
tables (e.g. acpi_match_device). To better support these APIs an
additional section is added at the end of the probe table. This
section can be used to add a sentinel for tables that require it.

Signed-off-by: Agustin Vega-Frias <agustinv@...eaurora.org>
---
 include/asm-generic/vmlinux.lds.h | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/include/asm-generic/vmlinux.lds.h b/include/asm-generic/vmlinux.lds.h
index af24057..5894049 100644
--- a/include/asm-generic/vmlinux.lds.h
+++ b/include/asm-generic/vmlinux.lds.h
@@ -219,7 +219,8 @@
 	. = ALIGN(8);							\
 	VMLINUX_SYMBOL(__##name##_acpi_probe_table) = .;		\
 	KEEP(*(__##name##_acpi_probe_table))				\
-	VMLINUX_SYMBOL(__##name##_acpi_probe_table_end) = .;
+	VMLINUX_SYMBOL(__##name##_acpi_probe_table_end) = .;		\
+	KEEP(*(__##name##_acpi_probe_table_end))
 #else
 #define ACPI_PROBE_TABLE(name)
 #endif
-- 
Qualcomm Datacenter Technologies, Inc. on behalf of the Qualcomm Technologies, Inc.
Qualcomm Technologies, Inc. is a member of the Code Aurora Forum, a Linux Foundation Collaborative Project.