linux-kernel - [PATCH v17 19/35] arch/mm: Export direct {un,}map functions

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Message-ID: <20240222-gunyah-v17-19-1e9da6763d38@quicinc.com>
Date: Thu, 22 Feb 2024 15:16:42 -0800
From: Elliot Berman <quic_eberman@...cinc.com>
To: Alex Elder <elder@...aro.org>,
        Srinivas Kandagatla
	<srinivas.kandagatla@...aro.org>,
        Murali Nalajal <quic_mnalajal@...cinc.com>,
        Trilok Soni <quic_tsoni@...cinc.com>,
        Srivatsa Vaddagiri
	<quic_svaddagi@...cinc.com>,
        Carl van Schaik <quic_cvanscha@...cinc.com>,
        Philip Derrin <quic_pderrin@...cinc.com>,
        Prakruthi Deepak Heragu
	<quic_pheragu@...cinc.com>,
        Jonathan Corbet <corbet@....net>, Rob Herring
	<robh+dt@...nel.org>,
        Krzysztof Kozlowski
	<krzysztof.kozlowski+dt@...aro.org>,
        Conor Dooley <conor+dt@...nel.org>,
        Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will@...nel.org>,
        Konrad Dybcio <konrad.dybcio@...aro.org>,
        Bjorn Andersson
	<andersson@...nel.org>,
        Dmitry Baryshkov <dmitry.baryshkov@...aro.org>,
        "Fuad
 Tabba" <tabba@...gle.com>,
        Sean Christopherson <seanjc@...gle.com>,
        "Andrew
 Morton" <akpm@...ux-foundation.org>
CC: <linux-arm-msm@...r.kernel.org>, <linux-doc@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>, <devicetree@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>, <linux-mm@...ck.org>,
        Elliot Berman
	<quic_eberman@...cinc.com>
Subject: [PATCH v17 19/35] arch/mm: Export direct {un,}map functions

Firmware and hypervisor drivers can donate system heap memory to their
respective firmware/hypervisor entities. Those drivers should unmap the
pages from the kernel's logical map before doing so.

Export can_set_direct_map, set_direct_map_invalid_noflush, and
set_direct_map_default_noflush.

Signed-off-by: Elliot Berman <quic_eberman@...cinc.com>
---
 arch/arm64/mm/pageattr.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/arch/arm64/mm/pageattr.c b/arch/arm64/mm/pageattr.c
index 924843f1f661b..a9bd84588c98a 100644
--- a/arch/arm64/mm/pageattr.c
+++ b/arch/arm64/mm/pageattr.c
@@ -32,6 +32,7 @@ bool can_set_direct_map(void)
 	return rodata_full || debug_pagealloc_enabled() ||
 	       arm64_kfence_can_set_direct_map();
 }
+EXPORT_SYMBOL_GPL(can_set_direct_map);
 
 static int change_page_range(pte_t *ptep, unsigned long addr, void *data)
 {
@@ -176,6 +177,7 @@ int set_direct_map_invalid_noflush(struct page *page)
 				   (unsigned long)page_address(page),
 				   PAGE_SIZE, change_page_range, &data);
 }
+EXPORT_SYMBOL_GPL(set_direct_map_invalid_noflush);
 
 int set_direct_map_default_noflush(struct page *page)
 {
@@ -191,6 +193,7 @@ int set_direct_map_default_noflush(struct page *page)
 				   (unsigned long)page_address(page),
 				   PAGE_SIZE, change_page_range, &data);
 }
+EXPORT_SYMBOL_GPL(set_direct_map_default_noflush);
 
 #ifdef CONFIG_DEBUG_PAGEALLOC
 void __kernel_map_pages(struct page *page, int numpages, int enable)

-- 
2.34.1