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Message-Id: <20170815151242.2637861-1-arnd@arndb.de>
Date: Tue, 15 Aug 2017 17:11:58 +0200
From: Arnd Bergmann <arnd@...db.de>
To: Ulf Hansson <ulf.hansson@...aro.org>
Cc: Ingo Molnar <mingo@...nel.org>,
Byungchul Park <byungchul.park@....com>,
Peter Zijlstra <peterz@...radead.org>,
Arnd Bergmann <arnd@...db.de>,
Linus Walleij <linus.walleij@...aro.org>,
Shawn Lin <shawn.lin@...k-chips.com>,
Adrian Hunter <adrian.hunter@...el.com>,
linux-mmc@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH 1/2] mmc: test: reduce stack usage in mmc_test_nonblock_transfer
The new lockdep annotations for completions cause a warning in the
mmc test module, in a function that now has four 150 byte structures
on the stack:
drivers/mmc/core/mmc_test.c: In function 'mmc_test_nonblock_transfer.constprop':
drivers/mmc/core/mmc_test.c:892:1: error: the frame size of 1360 bytes is larger than 1024 bytes [-Werror=frame-larger-than=]
The mmc_test_ongoing_transfer function evidently had a similar problem,
and worked around it by using dynamic allocation.
This generalizes the approach used by mmc_test_ongoing_transfer() and
applies it to mmc_test_nonblock_transfer() as well.
Fixes: cd8084f91c02 ("locking/lockdep: Apply crossrelease to completions")
Signed-off-by: Arnd Bergmann <arnd@...db.de>
---
The patch causing this is currently part of linux-next, scheduled for
4.14, so it would be good to have this in the same release.
Since the change is not entirely trivial, please test this before applying.
---
drivers/mmc/core/mmc_test.c | 97 +++++++++++++++++++--------------------------
1 file changed, 41 insertions(+), 56 deletions(-)
diff --git a/drivers/mmc/core/mmc_test.c b/drivers/mmc/core/mmc_test.c
index 7a304a6e5bf1..478869805b96 100644
--- a/drivers/mmc/core/mmc_test.c
+++ b/drivers/mmc/core/mmc_test.c
@@ -800,38 +800,44 @@ static int mmc_test_check_broken_result(struct mmc_test_card *test,
return ret;
}
+struct mmc_test_req {
+ struct mmc_request mrq;
+ struct mmc_command sbc;
+ struct mmc_command cmd;
+ struct mmc_command stop;
+ struct mmc_command status;
+ struct mmc_data data;
+};
+
/*
* Tests nonblock transfer with certain parameters
*/
-static void mmc_test_nonblock_reset(struct mmc_request *mrq,
- struct mmc_command *cmd,
- struct mmc_command *stop,
- struct mmc_data *data)
+static void mmc_test_req_reset(struct mmc_test_req *rq)
+{
+ memset(rq, 0, sizeof(struct mmc_test_req));
+
+ rq->mrq.cmd = &rq->cmd;
+ rq->mrq.data = &rq->data;
+ rq->mrq.stop = &rq->stop;
+}
+
+static struct mmc_test_req *mmc_test_req_alloc(void)
{
- memset(mrq, 0, sizeof(struct mmc_request));
- memset(cmd, 0, sizeof(struct mmc_command));
- memset(data, 0, sizeof(struct mmc_data));
- memset(stop, 0, sizeof(struct mmc_command));
+ struct mmc_test_req *rq = kmalloc(sizeof(*rq), GFP_KERNEL);
- mrq->cmd = cmd;
- mrq->data = data;
- mrq->stop = stop;
+ if (rq)
+ mmc_test_req_reset(rq);
+
+ return rq;
}
+
+
static int mmc_test_nonblock_transfer(struct mmc_test_card *test,
struct scatterlist *sg, unsigned sg_len,
unsigned dev_addr, unsigned blocks,
unsigned blksz, int write, int count)
{
- struct mmc_request mrq1;
- struct mmc_command cmd1;
- struct mmc_command stop1;
- struct mmc_data data1;
-
- struct mmc_request mrq2;
- struct mmc_command cmd2;
- struct mmc_command stop2;
- struct mmc_data data2;
-
+ struct mmc_test_req *rq1, *rq2;
struct mmc_test_async_req test_areq[2];
struct mmc_async_req *done_areq;
struct mmc_async_req *cur_areq = &test_areq[0].areq;
@@ -843,12 +849,16 @@ static int mmc_test_nonblock_transfer(struct mmc_test_card *test,
test_areq[0].test = test;
test_areq[1].test = test;
- mmc_test_nonblock_reset(&mrq1, &cmd1, &stop1, &data1);
- mmc_test_nonblock_reset(&mrq2, &cmd2, &stop2, &data2);
+ rq1 = mmc_test_req_alloc();
+ rq2 = mmc_test_req_alloc();
+ if (!rq1 || !rq2) {
+ ret = RESULT_FAIL;
+ goto err;
+ }
- cur_areq->mrq = &mrq1;
+ cur_areq->mrq = &rq1->mrq;
cur_areq->err_check = mmc_test_check_result_async;
- other_areq->mrq = &mrq2;
+ other_areq->mrq = &rq2->mrq;
other_areq->err_check = mmc_test_check_result_async;
for (i = 0; i < count; i++) {
@@ -861,14 +871,10 @@ static int mmc_test_nonblock_transfer(struct mmc_test_card *test,
goto err;
}
- if (done_areq) {
- if (done_areq->mrq == &mrq2)
- mmc_test_nonblock_reset(&mrq2, &cmd2,
- &stop2, &data2);
- else
- mmc_test_nonblock_reset(&mrq1, &cmd1,
- &stop1, &data1);
- }
+ if (done_areq)
+ mmc_test_req_reset(container_of(done_areq->mrq,
+ struct mmc_test_req, mrq));
+
swap(cur_areq, other_areq);
dev_addr += blocks;
}
@@ -877,8 +883,9 @@ static int mmc_test_nonblock_transfer(struct mmc_test_card *test,
if (status != MMC_BLK_SUCCESS)
ret = RESULT_FAIL;
- return ret;
err:
+ kfree(rq1);
+ kfree(rq2);
return ret;
}
@@ -2329,28 +2336,6 @@ static int mmc_test_reset(struct mmc_test_card *test)
return RESULT_FAIL;
}
-struct mmc_test_req {
- struct mmc_request mrq;
- struct mmc_command sbc;
- struct mmc_command cmd;
- struct mmc_command stop;
- struct mmc_command status;
- struct mmc_data data;
-};
-
-static struct mmc_test_req *mmc_test_req_alloc(void)
-{
- struct mmc_test_req *rq = kzalloc(sizeof(*rq), GFP_KERNEL);
-
- if (rq) {
- rq->mrq.cmd = &rq->cmd;
- rq->mrq.data = &rq->data;
- rq->mrq.stop = &rq->stop;
- }
-
- return rq;
-}
-
static int mmc_test_send_status(struct mmc_test_card *test,
struct mmc_command *cmd)
{
--
2.9.0
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