修复kernel编译栈帧大小异常问题error: the frame size of 1928 bytes is larger than 1024 bytes
上图为编译异常时:
在原本代码上增加了一个spin原子锁,然后就编译不过
diff --git a/nvidia/drivers/optcamera_xdma/cdev_sgdma.c b/nvidia/drivers/optcamera_xdma/cdev_sgdma.c
index 94bdf43e9..5c8c912b5 100755
--- a/nvidia/drivers/optcamera_xdma/cdev_sgdma.c
+++ b/nvidia/drivers/optcamera_xdma/cdev_sgdma.c
@@ -575,6 +575,7 @@ static ssize_t char_sgdma_read_write(struct file *file, const char __user *buf,
struct xdma_dev *xdev;
struct xdma_engine *engine;
struct xdma_io_cb cb;
+//unsigned long irq_flag; //自旋锁 中断状态
#ifdef DBG_CHAR_SGDMA_READ_WRITE_TIMES
ktime_t curTime, curTime_wait_flag, curTime_align, curTime_memset, curTime_map, curTime_submit, curTime_unmap;
@@ -587,7 +588,8 @@ static ssize_t char_sgdma_read_write(struct file *file, const char __user *buf,
return rv;
xdev = xcdev->xdev;
engine = xcdev->engine;
-
+
+//spin_lock_irqsave(&xcdev->lock, irq_flag); //保存中断状态,禁止本地中断,并获取自旋锁
clean_fpga_irq(); //add by tab to call xdma
#ifdef DBG_CHAR_SGDMA_READ_WRITE_TIMES
@@ -673,6 +675,7 @@ static ssize_t char_sgdma_read_write(struct file *file, const char __user *buf,
printk(" %s wait_ts = %lld us, align_ts = %lld us, memset_ts = %lld us, map_ts = %lld us, submits_ts = %lld us, umap_ts = %lld us \n", __func__, curTime_wait_flagst, curTime_alignst, curTime_memsetst, curTime_mapst, curTime_submitst, curTime_unmapst);
#endif
//printk("enter %s end, line =%d \n", __func__, __LINE__);
+//spin_unlock_irqrestore(&xcdev->lock, irq_flag); //
return res;
}
加入修改好,则编译异常:
1、报错信息:
error: the frame size of 1928 bytes is larger than 1024 bytes [-Werror=frame-larger-than=]
那么解决方案:
2、报错打印分析
(1)编译器编译内核时,发现栈帧大小是1024字节,但是栈使用是1928字节,超过了默认栈帧大小;
(2)默认编译器是报警告信息,上面报错误信息是因为在编译器选项中添加了-Wall,把警告当错误处理;
3、报错解决
3.1、报错原因分析
(1)栈内存申请过大,或者函数调用层次太深都会导致栈溢出,引起系统崩溃,在编译时会去检查栈使用大小是否超过配置的栈大小;
(2)内核编译时会通过"-Wframe-larger-than=xxx"选项,传递给编译器栈大小,当编译器检测到栈使用大于阈值时,会产生一条警告信息;
转自大佬解说:
具体解决方案:
yahboom@yahboom-vm:~/r32.7.2_sources-sdk/Linux_for_Tegra/source/src_out/kernel_src_build/kernel$ git diff kernel-4.9/arch/arm64/configs/tegra_defconfig
diff --git a/kernel-4.9/arch/arm64/configs/tegra_defconfig b/kernel-4.9/arch/arm64/configs/tegra_defconfig
index a3904fa79..5fa971b20 100644
--- a/kernel-4.9/arch/arm64/configs/tegra_defconfig
+++ b/kernel-4.9/arch/arm64/configs/tegra_defconfig
@@ -1209,3 +1209,4 @@ CONFIG_ARCH_TEGRA_23x_SOC=y
CONFIG_TEGRA_SAFETY=y
CONFIG_VIDEO_OPTCAMERA_XDMA=y
CONFIG_OPT_IDE1_DIO=y
+CONFIG_FRAME_WARN=4096
yahboom@yahboom-vm:~/r32.7.2_sources-sdk/Linux_for_Tegra/source/src_out/kernel_src_build/kernel$
3.3、栈大小的影响
3.3.1、栈比较大
比如栈大小使用8K
(1)优点:栈比较大,不容易导致栈溢出;
(2)缺点:浪费内存,有些时候根本用不到这么大的栈内存;并且内存是4K分页,创建一个内核栈就需要申请连续2块的4K页,内存紧张的时候,申请8K的连续内存比申请4K困难的多;
3.3.2、栈比较小
比如栈大小1K
(1)优点:节省内存,都占用不到一个4K页,创建内核栈时比较容易;
(2)缺点:因为栈比较小,容易栈溢出;
3.4解决措施
(1)修改内核配置项,把"CONFIG_FRAME_WARN"配置项改大一点;
(2)修改程序,不要超过内核配置的栈大小;
补充:目前我所接触到的内核配置,32位的系统配置的栈大小一般是1K,64位的系统栈大小一般是4K;
原文地址:https://blog.csdn.net/hezhensheng007/article/details/143918020
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