linux-kernel - [PATCH] remoteproc: qcom: pil-info: avoid 64-bit division on 32-bit architectures

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Date:   Mon,  8 Mar 2021 16:32:02 +0100
From:   Arnd Bergmann <arnd@...nel.org>
To:     Andy Gross <agross@...nel.org>,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        Ohad Ben-Cohen <ohad@...ery.com>
Cc:     Arnd Bergmann <arnd@...db.de>, Vinod Koul <vkoul@...nel.org>,
        Mathieu Poirier <mathieu.poirier@...aro.org>,
        linux-arm-msm@...r.kernel.org, linux-remoteproc@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH] remoteproc: qcom: pil-info: avoid 64-bit division on 32-bit architectures

From: Arnd Bergmann <arnd@...db.de>

In some randconfig builds, a 64-bit resource_size_t is used even on
32-bit architectures, which now leads to a link-time error:

ERROR: modpost: "__aeabi_uldivmod" [drivers/remoteproc/qcom_pil_info.ko] undefined!

Using the div_u64() helper here. A cast to 32 bits length would also
work, but for a constant divider there should not be much difference.

Fixes: 549b67da660d ("remoteproc: qcom: Introduce helper to store pil info in IMEM")
Signed-off-by: Arnd Bergmann <arnd@...db.de>
---
 drivers/remoteproc/qcom_pil_info.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/remoteproc/qcom_pil_info.c b/drivers/remoteproc/qcom_pil_info.c
index 5521c4437ffa..95b6b7609a87 100644
--- a/drivers/remoteproc/qcom_pil_info.c
+++ b/drivers/remoteproc/qcom_pil_info.c
@@ -56,7 +56,8 @@ static int qcom_pil_info_init(void)
 	memset_io(base, 0, resource_size(&imem));
 
 	_reloc.base = base;
-	_reloc.num_entries = resource_size(&imem) / PIL_RELOC_ENTRY_SIZE;
+	_reloc.num_entries = div_u64(resource_size(&imem),
+				     PIL_RELOC_ENTRY_SIZE);
 
 	return 0;
 }
-- 
2.29.2